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"Exercises in Euclid," by William Weeks; "Utility of Quaternions in Physics," by Alexander McAulay.

In the Clarendon Press list are:-Locke's "Essay concerning Human Understanding," edited by Dr. A. C. Fraser; "Mathematical Papers of the late Prof. Henry J. S. Smith, with portrait and memoir, two volumes ; "A Supplementary Volume to Prof. Clerk Maxwell's Treatise on Electricity and Magnetism," by Prof. J. J. Thomson, F. R. S.; "A Manual of Crystallography," by Prof. M. H. N. Story-Maskelyne, F.R.S.; "Analytical Geometry," by W. J. Johnston; "A Treatise on the Kinetic Theory of Gases," by Dr. H. W. Watson, new edition; "An Elementary Treatise on Pure Geometry," with numerous examples, by J. W. Russell; "Index Kewensis Nominum Omnium, Generum et Specierum, Plantarum Phanerogamarum,' '1735-1885, Part I.; "Hospital Construction," by Sir Douglas Galton, F. R. S.

Messrs. Swan Sonnenschein and Co.'s list contains:

"Philosophy and Political Economy in their Historical Relations," by Dr. James Bonar; Appearance and Reality,' by F. H. Bradley]; "The Principles of Psychology," by G. F. Stout; "History of Philosophy," by Dr. Johann Eduard Erdmann, translated and edited by Prof. Williston S. Hough, third edition, revised, three volumes; "A Student's Text-Book on Botany," by Prof. Sidney H. Vines, F. R.S., copiously illustrated; "Text-book of Embryology: Invertebrates," by Drs. Korschelt and Heider, translated and edited by Dr. E. L. Mark and Dr. W. M. Woodworth, fully illustrated; "The Cell its Anatomy and Physiology," by Dr. Oscar Hertwig, translated and edited by Dr. H. J. Campbell, fully illustrated; "Text-Book of Paleontology for Zoological Students," by Theodore T. Groom, fully illustrated; "Lectures on Human and Animal Psychology," by Prof. Wilhelm Wundt, translated and edited by James Edwin Creighton and Edward Bradford Titchener; "Hand-book of Systematic Botany," by Prof. E. Warming, translated and edited by M. C. Potter, fully illustrated; "An Elementary Treatise on Practical Botany," by Prof. E. Strasburger, translated and edited by Prof. W. Hill. house, with 149 illustrations, third edition; "The Photographer's Pocket Book," by Dr. E. Vogel, translated by E. C. Conrad, with 63 illustrations; "How Nature Cures," by Dr. Emmet Densmore; Beauty and Hygiene for Women and Girls," by a Specialist; "A Popular History of Medicine," by Edward Berdoe, M. R.C.S.; "Introduction to the Study of the Amphioxus," by Dr. B. Hatschek and James Tuckey, illustrated; "Practical Bacteriology," by Dr. Migula, translated and edited by Dr. H. J. Campbell, illustrated; "Geology," by Dr. Edward B. Aveling, illustrated with a Geological Map and numerous woodcuts; "Zoology," by B. Lindsay, illustrated; "Fishes,' by the Rev. H. A. Macpherson; "Flowering Plants," by James Britten; "Grasses," by W. Hutchinson; "Mammalia," by the Rev. H. A. Macpherson.

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Messrs. George Philip and Son will publish:-" Philip's Atlas Guide to the Continent of Europe," a series of 72 plates, with descriptive letter-press, by J. Bartholomew; "Philip's Systematic Atlas for Higher Schools and General Use," a series of physical and political maps, with diagrams and illustrations of astronomy and physical geography, by E. H. Ravenstein; "Philip's Anatomical Model of the Human Body," illustrating the construction of the Human Frame and the relative positions of its various organs by means of superimposed plates printed in colours; "The Celestium, or Patent Astronomical Calendar for recording and illustrating in miniature the daily and hourly positions of the heavenly bodies as they pass through the Sign of the Zodiac."

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Messrs. Percival and Co. give notice of :-"The School Euclid," an edition of Euclid, Books III. to VI., with notes and exercises, by Daniel Brent; The Beginner's Text Books of Science: "Chemistry," by G. Stallard; Geology," by C. L. Barnes; "Electricity and Magnetism," by L. Cumming; 'Heat," by G. Stallard; Light," by H. P. Highton; "Mechanics' (treated experimentally), by L. Cumming; "Physical Geography," by C. L. Barnes; "Practical Physics," an introductory handbook for the physical laboratory, in three parts, by Prof. W. F. Barrett; Part II. Heat, Sound, and Light. Part III. Electricity and Magnetism, Electrical Measurements; "Practical Lessons and Exercises in Heat for use in schools and Junior University classes, by A. D. Hall. In Messrs. A. and C. Black's announcements we notice: Illustrated Text-Book of Invertebrate Zoology,' by A. E. Shipley; "History of Astronomy during the

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Nineteenth Century," by Agnes M. Clerke, third ed revised and enlarged; "Algebra, an Elementary Text-Book the Higher Classes of Secondary Schools and Colleges," > Prof. George Chrystal, Part I., third edition.

Messrs. Crosby Lockwood and Son have in hand :-A s and enlarged edition (the third) of Prof. R. Wallace's "Fi Live Stock of Great Britain," containing additional photor engravings of notable specimens of live stock; and a t volume by Prof. Sheldon on "British Dairying."

Mr. Walter Scott will issue in the "Contemporary Scr. Series":-" Modern Meteorology," by Dr. Frank Wa with 112 illustrations.

UNIVERSITY AND EDUCATIONAL
INTELLIGENCE.

OXFORD.-Two Radcliffe Travelling Fellowships, each the value of £200 per annum, and tenable for three years, b been awarded this week. One, which has been gained by M E. A. Minchin, of Keble College, was thrown open last year candidates in all branches of science, and the usual declara that the Fellow intends to graduate in medicine and to re abroad with a view to his improvement in that study has be dispensed with. Mr. Minchin was placed in the first class the Honour School of Natural Science (Morphology) in the The other Fellow, Mr. W. Ramsden, of Keble College, is ject to the usual conditions attached to these Fellowships V in 1892. Ramsden obtained a first class in Natural Science (Physic

The new laboratories for the department of human anatom are rapidly approaching completion, and will, when finis add very much to the convenience and advantages of mea students. The buildings have been designed after the plans Mr. Arthur Thompson, and include a large dissecting room an several additional laboratories and private rooms, a lec theatre, and a large basement.

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Royal Geographical Society have renewed their generous our CAMBRIDGE.-The Council of the Senate report that the to provide 150 a year as part of the stipend of a geographic lecturer for the ensuing five years, and to award biennialiy in the University. The Council recommend that the propos hibitions or prizes for the encouragement of geographical resear of the society be accepted, and that a lecturer be appa under the supervision of a joint committee of manage before the end of the Easter Term, 1893.

The Sedgwick Memorial Syndicate report that they Museum in Downing Street, with a view to meeting obe made certain alterations in the plans for the proposed Geol.p that were raised and to reducing somewhat the cost of building. The Syndicate ask to be authorised to obtain tent for the immediate construction of the museum.

SCIENTIFIC SERIALS.

American Meteorological Journal, February.-Hot wa Texas, May 29 and 30, 1892, by I. M. Cline. Hot * occur to some extent every year, but rarely with suffice. tensity to injure vegetation. It was estimated that in the pre case 10,000 acres of cotton were destroyed, and corn s severely. The temperatures reported ranged generally 90° to 100°, and in some parts from 105° to 109'. These appear to have resulted from the same causes which proce Föhn in Switzerland, the descent of dry air which has dep its vapour during its ascent.-The electrification of the -air during auroral displays, by A. McAdie. The author an account of some experiments made at Blue Hill observ for obtaining, by means of a kite flown during thunderstorm better record of the potential of the air than could be given collector near the ground, by which plan some remarkaär " sults were obtained, and he suggests similar experime showing the electrification of the lower air during disti aurora. He also proposes a new classification of the auroral phenomena, distinguishing between the highly displays, and those of less intensity which probably the lower atmosphere.-Practical koniology, by Prol. Ce Abbe. He applies this term to the study of atmospher and floating germs, and shows how their injurious e

ain industries may be obviated. The sling psychrometer, Prof. H. A. Hazen, and the aspiration versus the sling chrometer, by A. L. Rotch. Both papers deal with the parative merits of the two instruments for balloon observa

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Viedemann's Annalen der Physik und Chemie, No. 2.ong the papers in this number are the following:-A ified astatic galvanometer, by H. E. J. G. du Bois and H. Dens. To minimise the effects of disturbing vibrations as lucing false oscillations about a vertical axis, the suspended m is given perfect "inertia symmetry" about the axis of fibre, and all flat parts of it are distributed so as to have al areas in two mutually perpendicular planes. Quartz fibres used for suspension.-Bolometric investigations of the ing spectrum, by F. Paschen.-The fundamental law Complementary colours, by Paul Glan. To determine amount of light absorbed by the pigment of the yellow during transmission to the optically sensitive nerves, candles of equal luminosity were observed with one eye ugh glasses of various colours, the one direct, and the other uch an angle that its image fell outside the margin of the w spot. The candles were shifted till both appeared ally bright, and their respective distances were measured. ing the coefficient of absorption for red light as = I, that yellow (5828) was o 889, for wave-length 5222 it was o'171, 5 blue) 0'269, and for white light 0'424. In this way the clusion was arrived at that the intensities of complementary urs reaching the retina must be equal in order to give the ression of white.—Experiences with the self-acting mercury p, by A. Raps. Several improvements are described, ing to make the working more rapid. It was found that fear of contaminating the mercury by the use of black ble india-rubber tubes was unfounded.

SOCIETIES AND ACADEMIES.
LONDON.

ntomological Society, February 22.-Mr. Henry John $, President, in the chair.-Mr. F. J. Hanbury exhibited, on If of Mr. Percy H. Russ, of Sligo, several long and very variseries of Agrotis tritici, A. valligera, and A, cursoria, together Irish forms of many other species, some of which we ve to be new to Ireland. Mr. W. H. B. Fletcher made remarks on the species.-Mr. R. W. Lloyd exhibited mens of a species of Acarus found in New Zealand wheat. ated that Mr. A. D. Michael had examined the specimens, pronounced them to belong to Tyroglyphus farine, a species had been known for over a hundred years as a destroyer rn, and was only too abundant all over Europe, and proover the temperate regions of the world -Mr. E. B. on, F. R. S., exhibited, and made remarks on, a number

oons of Halias prasinana, in order to show the changes our produced in them by their surroundings; he also ited the coloured backgrounds employed by him in his rexperiments on the colours of larvæ and pupae, and illustrated narks by numerous drawings on the blackboard.-Dr. T. A. man exhibited by means of the oxy-hydrogen lantern, photos of the larva of Nemeobius lucina in its first stage, showing onjoined dorsal tubercles, each carrying two hairs, which markable in being divided into two branches. For comn he also showed, by means of the lantern, drawings of ung larva of Papilio ajax, after Scudder, and of a portion gment of Smerinthus populi, as the only instances known ) of similar dichotomous hair sin lepidopterous larvæ. Mr. on pointed out that he had described the forked hairs of nthus in the Society's "Transactions" for 1885, and that airs were even better developed in the genus Hemaris ally described, as he believed, by Curtis. Mr. Poulton, id that he had noticed similar forked hairs covering the -hatched larvæ of Geometra papilionaria.-Dr. Chapman paper-which was illustrated by the oxy-hydrogen lantern led "On some neglected points in the structure of the of Heterocerous Lepidoptera and their probable value in ication." A discussion ensued, in which Mr. Poulton, Mr. pion, and Mr. Merrifield took part.-Dr. F. A. Dixey nicated a paper entitled "On the phylogenetic signifi of the variations produced by differences of temperature Inessa atalanta." The President, Mr. Merrifield, Mr. n. Dr. Chapman, and Mr. Tutt took part in the discussion ensued.

Zoological Society, February 28.-Sir W. H. Flower, F.R. S., President, in the chair.-Mr. A. D. Michael exhibited some specimens of the Ixodes, known locally in the West Indies as the "St. Kitts" or "Gold Tick," received from Mr. C. A. Barber, of the Agricultural Department, Antigua.-A communication was read from M. A. Milne-Edwards respecting Lemur nigerrimus, Sclater, a species of lemur originally described from an example living in the Society's Gardens. It was pointed out that Prosimia rufipes of Gray had been based on a female of this species.-Mr. Howard Saunders exhibited and made remarks on a specimen of the American stint (Tringa minutilla), shot at Northam Burrows, North Devon, by Mr. Broughton Hawley, in August, 1892.-Mr. Sclater (on behalf of Mr. R. M. Barrington) exhibited a specimen of the Antarctic Sheathbill (Chionis alba), killed at the Carlingford Lighthouse, co. Down, Ireland, in December last.-Dr. C. J. ForsythMajor read a memoir on some of the miocene squirrels, and

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added remarks on the dentition and classification of the Sciurida in general. The author proposed a new division of this family into three subfamilies-Sciurinæ, Pteromyinæ, and Nannosciurinæ. The genera Spermophilus and Arctomys and the allied forms were united to the Sciurinæ. The last part of the paper dealt with the primitive type of the Sciurine molar.-Mr. Henry O. Forbes read a paper entitled "Observations on the Development of the Rostrum in the Cetacean Genus Mesoplodon. with remarks on some of the Species. Mr. Forbes showed that in this genus the vomerine canal in the young animal is filled with cartilage, and in the adult with a dense petrosal mesorostral bone. From the examination of thirteen specimens of Mesoplodon grayi and four of M. layardi, of which he had made a large number of sections in various stages of growth, the author concluded that the mesorostral bone was not, as had been generally believed, an ossification of the cartilage, but an actual growth of the vomer and of the premaxillaries, with perhaps, in some cases, additions from the ossification of the cartilage of the vomerine spout. The cause of the growth in the vomer might be accounted for by the pressure communicated to it by the growth of the premaxillaries, induced, perhaps, by the movement, which appears to take place, of the maxillaries over the premaxillaries.

Linnean Society, March 2.-Prof. Stewart, President, in the chair.-Mr. Miller Christy exhibited some photographs of the American bison taken from living wild animals, and gave some account of the present restricted distribution of the species. Mr. A. G. Renshaw and Mr. W. Carruthers detailed what they former haunts.-Mr. J. M. Macoun gave an account of the flora had been able to learn respecting it while travelling in its of the Behring's Sea Islands from personal exploration.-On behalf of Mr. H. N. Ridley the Secretary read a paper on the flora of the eastern coast of the Malay archipelago. The meeting then adjourned to March 16.

Anthropological Institute, February 21.-Prof. A. Macalister, F. R. S., President, in the chair.-A paper, by Mr. E. H. Man, on Nicobar pottery was read. He stated that the little island of Chowra has held for generations a monopoly of the manufacture. Preparing the clay, and moulding and firing the finished utensil, devolves on the females. The value of trade marks is recognised, the device of its maker being affixed to each vessel. Experience having taught them that pots are more serviceable if allowed to harden gradually, they store newly-made utensils on a lattice platform in the roofs of their huts. In a year the heat and smoke render them hard and durable. Indian pots and jars are readily purchased from the traders, who occasionally visit the islands; but they are deemed unsuitable for certain culinary operations. There are no special vessels made for funeral purposes; but, in accordance with the almost universal custom of uncivilised races, cooking pots are among the personal and household requisites which are laid on a grave after an interment. A paper, by Lieut. Boyle, T. Somerville, R. N., on some islands of the New Hebrides was read. The habits of the natives of adjacent islands sometimes vary exceedingly, and in this paper reference was made only to a small portion of the group, including the Efate Islands, the Shepherd Islands, and the East Coast of Malekula. A child calls all his uncles on both sides, "father," all his aunts, "mother," and his first cousins on both sides, "sister" or "brother." A man cannot marry woman of his own tribe, and the children belong to their mother's tribe; the property of their father going, at his death, to his sister's children. It sometimes happens that a man will

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call a small girl mach younger than himself "mother." Circumcision takes place between the ages of five and ten. Till then a boy goes baked; but afterwards he is costumed like the men. When a Malekulan is old and decrepit, he has nothing to look forward to but burial alive. Should an old person become bedridden, or a burden, he or she is told quite simply that his or her burial will occur on such a day. Invitations to the funeral feast are then sent out, and, dead or not dead, on that date the unhappy person is buried.

PARIS.

Tænite (Fe, Ni) and plessite (Fe, Ni). In composition it closely with the entirely metallic type called jewellite, b differs from the latter in structure. Apart from the per portions the mass consists of lamellæ of tænite arrange bundles which frequently intersect at the angles of the hedron. The intervals are filled up with plessite which may distinguished at once by its dark-grey colour, contrasting the polished steel tint of the other alloy. Some specimen the meteorite show quite exceptional characters. W usual structure and cohesion they are formed of opaque the mineral grains cemented by a network of oxidised iron. T have probably been produced by an alteration of the t specimens, in which the metallic skeleton has been oxidisel GÖTTINGEN.

Royal Society of Sciences.-From July 27 to Decembe 28, 1892, the following papers of scientific interest have t peared in the Nachrichten :

July.-Drude: Current theories of light practically tester Ehlers: On Arenicola marina, L. (five pages).-Rhumbler. so-called germ-spherules (Max Schultze) of Foraminifera (the are stated to be merely deposits of iron silicates).-Nernst: T change of free energy in the mixture of concentrated sol

September. Fricke: A general arithmetical principle theory of automorphic functions.-Koblrausch: On the fluence of time upon solutions of sodium silicates.

November.-Peter: Botanical work in the summer of Voigt: On a problem in fluid motion.-Sella and Ver The rupture coefficient of rock salt.-Kallius: The nec cells of peripheral nerves.

December.-Wagner: The third (Peter Apian's) map is world (1530).

CONTENTS.

Theory of the Sun. By A. F...
Elementary Biology. By W. N. P.
Van't Hoff's "Stereochemistry." By F. R. J. .
Our Book Shelf:-

Wettstein: "Die Fossile Flora der Höttinger Brescie.
-J. S. G..

Mee: "Observational Astronomy."-W. J. L.
Loney: Mechanics and Hydrostatics for Beginners.
-G. A. B.

Academy of Sciences, February 27.-M. de LacazeDuthers in the chair.-On the attempt at oyster culture in the Roscof laboratory, by M. de Lacaze-Duthiers. In April, 1890, a set of seed oysters were introduced into a tank in the grounds of the observatory, which lies opposite Batz Island, in the Channel They were always submerged, but exposed to tidal changes of level. In a year they had acquired a considerable size, but had not yet "fattened.' Last November they had a size and favour which, in M. Chatin's opinion, surpassed the qualities attained in any other locality along the coast, although it the warmer months preceding (the months without R) they had shared the decline common to all oysters at that period. It was also found that the oysters in the tank acquired longer-Hilbert: Third note on algebraical invariants. ** beards," and also increased in length, whilst others cultivated on the shores of Batz Island, and often left dry at low water, were more developed in the direction of thickness. As regards reproduction, the results have been fairly favourable, although definite data have not yet been obtained. In one case, where part of the tank water had been pumped into a reservoir used for supplying an aquarium,some embryos were drawn up through the pipes, and fixed themselves on the wooden level-ball, where a colony of about a dozen well-developed oysters was subsequently found, some of which now measure 6 cm. across.-On the exact determination of the pepto-saccharifiant action of the organs, by MM. R. Lépine and Metroz.-On the photographs of the moon enlarged by Prof. Weinek, by M. Faye. These photographs are enlargements by twenty times of some of the Lick photographs of the moon, obtained by an exposure lasting several days. On their being exhibited, several members expressed their opinion that they had been retouched.-On the urea contained in the blood in cases of eclampsia, by M. L. Butte. It is found that in cases terminating fatally the amount of urea contained in the blood is less than in cases of recovery, owing to hepatic alterations, which in the former cases impair the secretion of urea. From the point of view of prognostication, therefore, recovery can be anticipated if the amount of urea is two or two and a half times the normal amount, but a fatal issue if the amount closely approximates to the physiological figure.— On the general problem of integration, by M. Riquier. -On certain differential equations of the first order, by M. Vessiot. Remarks concerning a preceding note on a generalisation of Lagrange's series, by M. E. Amigues. Physical properties of fused ruthenium, by M. A. Joly (see Notes). -On Stas's determination of the atomic weight of lead, by M. G. Hinrichs. In Stas's determinations of the atomic weight from the sulphate and the nitrate the weight of substance taken, according to M. Hinrichs, enters as a continuously changing element into the result, owing to a systematic error in Stas's arrangement. In plotting the atomic weights in terms of weight of substance taken, curves are obtained showing a minimum at about 150 gr. The method of averages is therefore inadmissible, and a new method is promised in a forthcoming communication.-On the aldehydes of the terpenes, by M. A. Étard.-On the constitution of hydrated alkaline phenates, by M. de Forcrand. On the alkaloids of cod-liver oil, their origin and therapeutic effects, by M. J. Bouillot.-On a pathogenic microbe of blennorhagic orchitis, by MM. L. Hugounenq and J. Eraud.-Crustacea and cirrhipeds commensal with the Mediterranean turtles, by MM. E. Chevreux and J. de Guerne.-On a terrestrial leech of Chili, by M. Raphael Blanchard. This animal, which has been named Mesobdella brevis, forms a link between the Glossiphonidæ and the Hirudinidæ. Among the latter it approaches most closely the Hemadipsine by its mode of living and its ten large black eyes, but differs from the whole family by the great condensation of its somites.-Mineralogical and lithological examination of the meteorite of Kiowa county, Kansas, by M. Stanislas Meunier. The metallic portion presents two principal alloys of iron and nickel, which an attentive study has succeeded in characterising :

Letters to the Editor:

The Glacier Theory of Alpine Lakes.-Dr. Alfred
Russel Wallace

Waves as a Motive Power.-H. Linden

Blind Animals in Caves.-J. T. Cunningham; A
Anderson

Foraminifer or Sponge?-R. Hanitsch .

A Magnetic Screen.-Frederick J. Smith
On Electric Spark Photographs; or, Photography
of Flying Bullets, &c., by the Light of the Electric
Spark. II. (Illustrated.) By C. V. Boys, F.R.S.
Micro-organisms and their Investigation. By M
Percy Frankland

The Ordnance Survey
Notes ..

Our Astronomical Column:—

Comet Brooks (November 19, 1892).
Comet Holmes (1892 III.)
Universal Time

The Bielids, 1892.

The Wolsingham Observatory
United States Naval Observatory
Yale Astronomical Observatory
Geographical Notes

Stromboli. By Dr. H. J. Johnston-Lavis
Forthcoming Scientific Books
University and Educational Intelligence
Scientific Serials.

Societies and Academies

DIARY OF SOCIETIES.

LONDON.

THURSDAY, MARCH 9.

ROYAL SOCIETY, at 4.30.-On the Evidences of a Submergence of SouthWestern Europe, and of the Mediterranean Coasts, at the Close of the Glacial or so-called Post-Glacial Period, and immediately preceding the Neolithic or Recent Period: Prof. Prestwich, F.R.S.-The Electrolysis of Steam: Prof. J. J. Thomson, F.R.S.-On the Geometrical Construction of the Oxygen Absorption Lines, Great A, Great B, and a of the Solar Spectrum: G. Higgs.-Upon the Existence of more than one Fungus in Madura Disease (Mycetoma): Prof. Boyce and Dr. Surveyor. MATHEMATICAL SOCIETY, at 8.-The Dioptrics of Gratings: Dr. J. Larmor, F.R.S.-On Symmetry existing among the Elements of Heinean Series: Prof. L. J. Rogers.-Note on the Stability of a Thin Rod Loaded Vertically: A. E. H. Love.-On Complex Primes Formed with the Fifth Roots of Unity: Prof. Lloyd Tanner.-Stereographs of the Regular Solids: T. J. Dewar.

INSTITUTION OF ELECTRICAL ENGINEERS, at 8.-Notes on Testing Alternators: W. M. Mordey. (Discussion.)

ROYAL INSTITUTION, at 3-The Great Revival-A Study in Mediæval History Rev. Augustus Jessopp.

FRIDAY, MARCH 10.

PHYSICAL SOCIETY, at 5.-The Application of Lagrange's Equations of Motion, with Especial Reference to a Perforated Solid in a Liquid: Dr. C. V. Barton.-On the Magnetic Field of a Circular Current: Prof. G. M. Minchin.-On the Differential Equation of Electrical Flow: T. H. Blakesley.

ROVAL ASTRONOMICAL SOCIETY, at 8.

INSTITUTION OF CIVIL ENGINEERS, at 7.30.-Methods adopted in Constructing the Glasgow Central Railway Works-Bridgeton and Trongate Contracts: Charles D. Barker.

ROVAL INSTITUTION, at 9.-Early Myth and Late Romance: Sir Herbert Maxwell, Bart., M..

AMATEUR SCIENTIFIC SOCIETY, at 7.-(1) On the Occurrence of Topaz in Lithophyses; (2) On the Relations of Cornish Apatites to their Environ. ments: W. Simmons. - Recent Additions to Botanical Science: L. A. Boodle.

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ZOOLOGICAL SOCIETY, at 8.30.-Suggestions for the more Definite Use of the Word Type' " and its Compounds, as denoting Specimens of a Greater or Less Degree of Authenticity: Oldfield Thomas.-On a New Genus and Species of Acarus found in Cornwall: A. D. Michael. In a New African Monkey, with a List of the described Species of Cercopithecus: P. L. Sclater, F. R.S.-On the Variation and Development of the Vertebral and Limb Skeletons of the Amphibia: Prof. Howes. INSTITUTION OF CIVIL ENGINEERS, at 8.-On Plant for Harbour and SeaWorks: Walter Pitt. (Discussion.)

ROYAL INSTITUTION, at 3.-Physical and Psychical Neurology: Prof. Victor Horsley, F.R.S.

ESSEX FIELD CLUB, at 7 (at Stratford Town Hall).-Protection in Nature: Colonel Swinhoe.

PHOTOGRAPHIC SOCIETY, at 8.-Naturalistic Photography: P. H. Emer

son.

WEDNESDAY, MARCH 15

ROVAL MICROscopical_SocIETY, at 8.-Worms Simulating the Appearance of Tuberculosis: Dr. G. M. Giles.-New Brackish Water Infusoria from the United States: Dr. A. Stokes.-Rotifera of China: Surgeon V. G. Thorpe.

INSTITUTION OF CIVIL ENGINEERS, at 2.-Students' Visit to the East London Water-Works, Lea Bridge. (Train leaves Liverpool Street at 1.35

THURSDAY, MARCH 15.

ROYAL SOCIETY, at 4.30.
LINNEAN SOCIETY, at 8.-Bo'anical Results of the Sierra Leone Boundary
Commission: G. F. Scott Elliot.-Contributions to the Arthropod Fauna
of the West Indies; R. I. Pocock.

CHEMICAL SOCIETY. at 8-Limits of Accuracy of Gold-bullion Assay and the Losses of Gold Incidental to it: T. K. Rose. -Boiling-Point of Liquid Nitrous Oxide at Atmospheric Pressure and on the Melting-Point of Solid Nitrous Oxide: W. Ramsay, F.R.S., and Dr. John Shields.-Isomerism of Aliphatic Aldoximes: W. R. Dunstan and T. Dymond.-Formic Aldoxime W. R. Dunstan.-Properties of a Benzaldoxime: W. R. Dunstan and M. C. Luxmore.

ROYAL INSTITUTION, at 3. -The Great Revival-A Study in Mediæval History: Rev. Augustus Jessopp.

FRIDAY, MARCH 17.

ROYAL INSTITUTION, at 9.-Ancient Egyptian Pigments: Dr. William James Russell, F.R.S.

SATURDAY, MARCH 18.

ROYAL INSTITUTION, at 3.-Sound and Vibrations: The Right Hon. Lord Rayleigh, F.R.S.

SCIENTIFIC

WORTHIES.

The following is a list of the Steel Portraits

that have appeared in the above Series:

MICHAEL FARADAY.

THOMAS HENRY HUXLEY.
CHARLES DARWIN.
JOHN TYNDALL.

GEORGE GABRIEL STOKES.
SIR CHARLES LYELL.

SIR CHARLES WHEATSTONE.
SIR WYVILLE THOMSON.
ROBERT WILHELM BUNSEN.
ADOLF ERIK NORDENSKJÖLD.

LORD KELVIN.

HERMANN L. F. HELMHOLTZ.
SIR JOSEPH DALTON HOOKER.
WILLIAM HARVEY.

SIR GEORGE B. AIRY.
J. LOUIS R. AGASSIZ.

JEAN BAPTISTE ANDRÉ DUMAS.
SIR RICHARD OWEN.
JAMES CLERK MAXWell.
JAMES PRESCOTT JOULE.
WILLIAM SPOTTISWOODE.
ARTHUR CAYLEY.

SIR C. W. SI EMENS.

JOHN COUCH ADAMS.

JAMES JOSEPH SYLVESTER.

DMITRI IVANOWITSH MENDELEEFF. LOUIS PASTEUR.

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MESSRS. MACMILLAN AND CO.'S PUBLICATIONS.

NEW

AND

RECENT

MATHEMATICAL BOOKS.

COMMERCIAL EDUCATION SERIES.-NEW VOLUME.

COMMERCIAL ARITHMETIC. By S. JACKSON, M.A., formerly Post-Master Merton College, Oxford; lately Master in the Nottingham High School; Head Master of Victoria College, Congle Globe 8vo, 3s. 6d.

MR. J. EDWARDS.-DIFFERENTIAL CALCULUS FOR SCHOOLS. E JOSEPH EDWARDS, formerly Fellow of Sidney Sussex College, Cambridge. Globe 8vo, 45. 6d.

"The present small volume," says the Author in his Preface, "is intended to form a sound introduction to a study y Differential Calculus suitable for the beginner. It does not therefore aim at completeness, but rather at the omission of all paruwhich are usually considered best left for a later reading. At the same time it has been constructed to include those parts of the rw prescribed in Schedule I. of the Regulations for the Mathematical Tripos Examination for the reading of students for Mathema'. Honours in the University of Cambridge. Particular attention has been given to the examples, which are freely interspersed thr out the text. For the most part they are of the simplest kind, requiring but little analytical skill. Yet it is hoped that they will e sufficient to give practice in the processes they are intended to illustrate. It is assumed that in commencing to work at the Differ Calculus the student possesses a fair knowledge of Algebra as far as the Exponential and Logarithmic Theorems; of Trigonomet far as De Moivre's Theorem, and of the rudiments of Cartesian Geometry as far as the equations of the several Conic Sections in simplest forms."

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PROF. G. W. JONES.-LOGARITHMIC

TABLES.

WILLIAM JONES, of Cornell University. Royal 8vo, 4s. 6d. net.
PROF. W. B. SMITH-INTRODUCTORY MODERN

By Prof. GEO!

GEOMETRY 0:

POINT, RAY, AND CIRCLE. By WILLIAM BENJAMIN SMITH, A. M., Ph.D, Professor of Mathematics Astronomy in the University of the State of Missouri. Crown 8vo, 5s. SCOTSMAN.-"The book presents its subject in a manner so fresh and novel as to be likely to inspire its students wi new interest in geometry, to afford a valuable diversion from the monotony of Euclid, and to make them better acquainted w and more interested in the intellectual aspects of the science. The book may be heartily recommended to the attention of teache and students."

A NEW ELEMENTARY ALGEBRA.

PROF. N.F. DUPUIS.—THE PRINCIPLES OF ELEMENTARY ALGEBR By N. F. DUPUIS, M.A., F.R.S. E., Professor of Pure Mathematics in the University of Queen's College, Kings. Canada. Crown 8vo, cloth, 6s.

SCOTSMAN.—“It is distinguished among works of its kind by the care and fulness with which it explains first princ;" It is so clearly and scientifically expounded that students in all stages of advancement will gain advantage by using it." LYCEUM.—“A book for which there was room; a book, too, which would deserve popularity in spite of any competiti

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A PRIMER OF CHAUCER. By ALFRED W. POLLARD. Pott 8vo, IS.

MANCHESTER GUARDIAN.-"Of the qualities required for making a good Primer Mr. Pollard has many; not knowledge, clearness, power of compacting and arranging, but soberness and caution, freedom from the fanatical and fantastic, those two curses of the English scholar. In all that concerns literary science, this is distinctly the best book on Chr that has yet appeared."

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A PRIMER OF PRACTICAL HORTICULTURE. Ten Lectures deliver for the Surrey County Council. By J. WRIGHT, F.R.H.S. (Horticultural Instructor), Assistant Editor of the Jes Horticulture, Editor of Garden Work. With 37 Illustrations. Pott 8vo, Is.

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