secondary batteries should become more permanent in their action than they are at the present time, they may be largely resorted to by consumers, to receive a charge of electrical energy during the day time, or the small hours of the night, when the central engine would otherwise be unemployed, and the advantage of resorting to these means will depend upon the relative first cost, and cost of working the secondary battery and the engine respectively. These questions are, however, outside the range of our present consideration. The large aggregate of dwellings comprising the metropolis of London covers about seventy square miles, thirty of which may be taken to consist of parks, squares, and sparsely inhabited areas, which are not to be considered for our present purpose. The remaining forty square miles could be divided into say 140 districts, slightly exceeding a quarter of a square mile on the average, but containing each fully 3,000 houses, and a population similar to that of St. James's. Assuming twenty of these districts to rank with the parish of St. James's (after deducting the 600 shops which I did not include in my estimate) as central districts, sixty to be residential districts, and sixty to be comparatively poor neighbourhoods, and estimating the illuminating power required for these three classes in the proportion of I to to, we should find that the total capital expenditure for supplying the metropolis with electric energy to the extent of 25 per cent. of the total lighting requirements would be or say 14,000, ocol., without including lamps and internal fittings, and making an average capital expenditure of 100,cool. per district. To extend the same system over the towns of Great Britain, and Ireland would absorb a capital exceeding certainly 64,000,000l., to which must be added 16,000,000l. for lamps and internal fittings, making a total capital expenditure of 80,000,000l. Some of us may live to see this capital realised, but to find such an amount of capital, and, what is more important, to find the manufacturing appliances to produce work representing this value of machinery and wire, must necessarily be the result of many years of technical development. If, therefore, we see that electric companies apply for provisional orders to supply electric energy, not only for every town throughout the country, but also for the colonies, and for foreign parts, we are forced to the conclusion that their ambition is somewhat in excess of their power of performance; and that no provisional order should be granted except conditionally on the work being executed within a reasonable time, as without such a provision the powers granted may have the effect of retarding instead of advancing electric lighting, and of providing an undue encouragement to purely speculative operations. The extension of a district beyond the quarter of a square mile limit, would necessitate an establishment of unwieldy dimensions, and the total cost of electric conductors per unit area would be materially increased; but independently of the consideration of cost, great public inconvenience would arise in consequence of the number and dimensions of the electric conductors, which could no longer be accommodated in narrow channels placed below the kerb stones, but would necessitate the construction of costly subways-veritable cava electrica. The amount of the working charges of an establishment comprising the parish of St. James's would depend on the number of working hours in the day, and on the price of fuel per ton. Assuming the 64,000 lights to incandesce for six hours a day, the price of coal to be 20s, a ton, and the consumption 2lbs. per effective horse power per hour, the annual charge under this head, taking eight hours' firing, would amount to about 18, 300%., to which would have to be added for wages, repairs, and sundries, about 6,0col., for interest with depreciation at seven-and-a-half per cent., 13,300l., and for general management say, 3,400/., making a total annual charge of 41,000/., or at the rate of 12s. 9 d. per incandescent lamp per annum. To this has to be added the cost of renewal of lamps, which may be taken at 5s. per lamp of sixteen candles, lasting 1,200 hours, or to 9s. per annum, making a total of 21s. 91d. per lamp for a year. In comparing these results with the cost of gas-lighting, we shall find that it takes 5 cubic feet of gas, in a good argand burner, to produce the same luminous effect as one incandescent light of 16-candle power. In lighting such a burner every day for six hours on the average, we obtain an annual gas consumption of 10,950 cubic feet, the value of which, taken at the rate of 25. 8d. per thousand, represents an annual charge of 295., howing that electric light by incandescence, when carried out on a large scale, is decidedly cheaper than gas-lighting at present prices, and with the ordinary gas-burners. On the other hand, the cost of establishing gas-works and mains of a capacity equal to 64,000 argand burners would involve an expenditure not exceeding 80,000l. as compared with 177,000, in the case of electricity; and it is thus shown that although it is more costly to establish a given supply of illuminating power by electricity than gas, the former has the advantage as regards current cost of production. It would not be safe, however, for the advocates of electric lighting to rely upon these figures as representing a permanent state of things. In calculating the cost of electric light, I have only allowed for depreciation and 5 per cent. interest upon capital expenditure, whereas [gas companies are in the habit of dividing large dividends, and can afford to supply gas at a cheaper rate, by taking advantage of recent improvements in manufacturing operations, and of the ever-increasing value of their by-products, including tar, coke, and ammoniacal liquor. Burners have, moreover, been recently devised by which the luminous effect for a given expenditure of gas can be nearly doubled by purely mechanical arrangements, and the brilliancy of the light can be greatly improved. On the other hand, electric lighting also may certainly be cheapened by resorting, to a greater extent than has been assumed, to arc lighting, which though less agreeable than the incandescent light for domestic purposes, can be produced at less than half the cost, and deserves on that account the preference for street lighting, and for large halls, in combination with incandescent lights. Lamps by incandescence may be produced hereafter at a lower cost, and of a more enduring character. Considering the increasing public demand for improved illumination, it is not unreasonable to expect that the introduction of the electric light to the full extent here contemplated, would go hand in hand with an increasing consumption of gas for illuminating and for heating purposes, and the neck-to-neck competition between the representatives of the two systems of illumination, which is likely to ensue, cannot fail to improve the quality, and to cheapen the supply of both, a competition which the consuming public can afford to watch with complacent selfsatisfaction. Electricity must win the day, as the light of luxury; but gas will, at the same time, find an ever-increasing application for the more humble purposes of diffusing light. In my address to the British Association I dwelt upon the capabilities and prospects of gas, both as an illuminant and as a heating agent, and I do not think that I was over-sanguine in predicting for this combustible a future exceeding all present anticipations. I also called attention to the advantages of gas as a heating agent, showing that if supplied specially for the purpose, it would become not only the most convenient, but by far the cheapest form of fuel that can be supplied to our towns. Such a general supply of heating separately from illuminating gas, by collecting the two gases into separate holders during the process of distillation, would have the beneficial effects 1. Of giving to lighting gas a higher illuminating power. 2. Of relieving our towns of their most objectionable trafficthat in coal and ashes. 3. Of effecting the perfect cure of that bugbear of our winter existence the smoke nuisance. 4. Of largely increasing the production of those valuable by. products, tar, coke, and ammonia, the annual value of which already exceeds by nearly 3,000,000l. that of the coal consumed in the gas-works. The late exhibitions have been beneficial in arousing public interest in favour of smoke abatement, and it is satisfactory to find that many persons, without being compelled to do so, are now introducing perfectly smokeless arrangements for their domestic and kitchen fires. The Society of Arts, which for more than 100 years has given its attention to important questions regarding public health, comfort, and instruction, would, in my opinion be the proper body to examine thoroughly into the question of the supply and economical application of gas and electricity for the purposes of lighting, of power production, and of heating. They would thus pave the way to such legislative reform as may be necessary to facilitate the introduction of a national system. If I can be instrumental in engaging the interest of the Society in these important questions, especially that of smoke prevention, I shall vacate this chair next year with the pleasing consciousness that my term of office has not been devoid of a practical result. UNIVERSITY AND EDUCATIONAL CAMBRIDGE. In the Higher Local Examination, in which the majority of the candidates are women, there was a notable falling off this year in the number of candidates in the Natural Science group of subjects. In 1880 there were 99, and 26 failed; in 1881 there were 89, and 17 failed; in 1882, only 39, and 9 failed. The total number of candidates increased from 882 in 1881 to 961 in 1882. The examiners' reports do not indicate any special falling off in the attainments shown by the candidates. In the elementary paper (including Physics, a d Biology) the results were not particularly satisfactory. Confusion in the use of terms was common, and the inability to use chemical formule was very marked in some cases. In Physiology mistakes were made with regard to subjects of great practical interest, and many of them might have been avoided by reference to every-day experience. In Chemistry the theory was better understood than practical laboratory details. A supplementary local examination was held in September, for the benefit of candidates seeking exemption from the Previous Examination, and of others desiring to become medical students, &c. Nineteen intending medical students entered, none of whom satisfied the requirements of the General Medical Council. The Fellows elected at St. John's College last week included Prof. W. J. Sollas, 1st class in the Natural Science Tripos, 1873, Professor of Geology in University College, Bristol, and author of many valuable geological and paleontological memoirs; Mr. J. S. Yeo, Second Wrangler and Second Smith's Prizeman, 1882. Dr. Hans Gadow will conduct an advanced class in the Morphology of the Vertebrata at the New Museum during the remainder of the present term. The Members appointed by the Senate on the General Board of Studies, on which much important work will henceforth devolve, are Messrs. Bradshaw (University Librarian), J. Peile, Prof. Cayley, Aldis Wright, Dr. Parkinson, Coutts Trotter, Dr. Phear (Master of Emmanuel College), and Prof. Stuart. The special Boards of Studies relating to Natural Sciences have selected the following representatives on the General Board of Studies:-Medicine, Prof. Paget; Mathematics, Dr. Ferrers ; Physics and Chemistry, Prof. Liveing; Biology and Geology; Music, Mr. Sedley Taylor. Prof. Stuart has issued his address as the liberal candidate for the University, in succession to the Right Hon. Sir H. Walpole, who proposes to resign. SCIENTIFIC SERIALS The American Journal of Science, October. -Notes on physiological optics, No. 5.-Vision by the light of the electric spark, by W. L. Stevens.-Crystals of monazite from Alexander county, North Carolina, by E. S. Dana.-Occurrence and composition of some American varieties of monazite, by S. L. Penfield.--Irregularities in the amplitude of oscillation of pendulums, by C. S. Peirce.-The Deerfield dyke and its minerals, by B. K. Emerson.-Occurrence of Siphonotreta scotica in the Útica formation near Ottawa, Ontario, by J. F. Whiteaves.A recent species of Heteropora, from the Strait of Juan de Fuca, by the same.-Notes on interesting minerals occurring near Pike's Peak, Colorado, by W. Cross and W. F. Hillebrand. Bulletin de l'Academie Royale des Sciences de Belgique, No. 8. -On the new note of M. Dupont concerning his re-vindication of priority of M. Dewalque.-On the means proposed for calming the waves of the sea, by M. Van der Mensbrugghe. —On the dilatation of some isomorphous salts, by M. Spring,-Notes of comparative physiology, by M. Fredericq.-On some brominated derivatives of camphor, by M. de la Royère.-On the central bone of the carpus in mammalia, by M. Lebourcq.-Action of chlorine on sulphonic combinations, and on organic oxysulphides, by MM. Spring and Wissinger. Verhandlungen der Naturforschenden Gesellschaft in Basel, Theil 7, Heft 1, 1882, contains: Studies on the history of the deer family, No. 1.-The skull structure, by L. Rütimeyer.— Studies on Talpa europea, by Dr. J. Kober. The literature is given in detail, followed by notes on the mole's place in the order, its local names and habits, and on its anatomy and development (plates 1 and 2, chiefly relating to dentition and embryos).— First supplement to the Catalogue of the Collection of Reptiles in the Basle Museum, by F. Müller. Notes are appended to some of the rarer species, and a new genus and species (Tropidocephalus azureus) are indicated for a form allied to Leiodera chilensis, Gray, taken in Uruguay; it is figured on plate 3. The register of the collection to December, 1881 indicates 933 species. On the hail-storm of June 29, 1879, by E. Haigenbach-Bischoff and others.-On the explosive powers of ice and on the Gletscherkorn, by E. H. Bischoff.-Meteorological Report for 1881, with reports by L. Rütimeyer on the comparative anatomy collections, and by F. Burckhardt and R. Holtz, on the map collection of the Society. SOCIETIES AND ACADEMIES Mathematical Society, November 9.-Mr. S. Roberts, F.R.S., president, in the chair.-After the reading of the Treasurer's and Secretaries' reports, the Chairman briefly touched upon the loss the Society had sustained during the recess, by the death of Prof. W. Stanley Jevons, F. R.S.-After the ballot for the Council of the ensuing session had been taken, Prof. Henrici, F.R.S., the newly elected president, took the chair, and called upon Mr. Roberts to read his address, which was entitled, "Remarks on Mathematical Terminology and the Philosophical Bearing of Recent Mathematical Speculations concerning the Realities of Space."-Mr. W. M. Hicks was admitted into the Society. The following communications were made :-On inand circumscribed polyhedra, Prof. Forsyth.-Note on quartic curves in space, Dr. Spottiswoode, P. R.S.—Note on the derivation of elliptic function formulæ from confocal conics, Mr. J. Griffiths. On the explicit integration of certain differential resolvents, Sir J. Cockle, F.R.S.-On compound determinants, Mr. R. F. Scott.-On unicursal twisted quartics, Mr. R. A. Roberts. Geological Society, November 1.-J. W. Hulke, F.R.S., president, in the chair.-Prof. Louis Lartet, of Toulouse, was elected a Foreign Correspondent of the Society.-The following communications were read :-The Hornblendic and other schists of the Lizard District, with some additional notes on the Serpentine, by Prof. T. G. Bonney, M.A., F.R.S., Sec. G.S. The author described the metamorphic series, chiefly characterised by hornblendic schist, which occupies the southern portion of the Lizard and an extensive tract to the north of the serpentine region, besides some more limited areas. He found that this series was separable into a lower or micaceous group--schists with various green minerals (often a variety of hornblende), or with brownish mica; a middle or hornblendic group, characterised by black hornblende; and an upper or granulitic group, characterised by bands of quartz-felspar rock, often resembling in appearance a vein-granite. These are all highly metamorphosed; yet the second and third occasionally retain to a remarkable extent indications of the minuter bedding structures, such as alternating lamination and current bedding of various kinds. They form, in the author's opinion, one continuous The general Journal of the Asiatic Society of Bengal, vol. 4, part 2, No. 1 strike of the series, though there are many variations, is either fragments of the hornblende schist and a kind of gneiss occur in a conglomerate in the former, south of Nare Point. The author considers the metamorphic series (the microscopic structure of which was fully described) undoubtedly Archæan, and probabiy rather early in that division. The rocks of the micaceous group have considerable resemblance in the greenish and lead-coloured schists of Holyhead Island and the adjoining mainland of Anglesey, and of the Menai Strait. Two outlying areas of serpentine, omitted in his former paper, were described-one at Polkerris, the other at Porthalla. The latter shows excellent junctions, and is clearly intrusive in the schist. The author stated that he had re-examined a large part of the district described in his former paper, and had obtained additional evidence of the intrusion of the serpentine into the sedimentary rock with which it is associated. This evidence is of so strong a nature that he could not conceive the possibility of any one who would carefully examine the district for himself, entertaining a doubt upon the matter.-Notes on some Upper Jurassic Astrorhizida and Lituolidæ, by Dr. Rudolf Häusler, F.G.S. PARIS Academy of Sciences, November 6.-M. Blanchard in the chair. The following papers were read :-On the comparative observation of telluric and metallic lines as a means of estimating the absorbent powers of the atmosphere, by M. Cornu. He selects telluric lines (caused by aqueous vapour, and varying in intensity with the amount of it) near D, the scale being four times as large as Angström's. Metallic lines, for comparison, are indicated; also a method of deducing the total quantity of vapour.-Results of experiments made at the exhibition of electricity, &c. (continued), by M. Allard and others. Three more systems are here discussed.-On M. Siemens' new theory of the sun, by M. Hirn. The recombination of the elements dissociated in space could occur only at a notable distance from the sun's photosphere, and on falling into this they must be anew entirely dissociated, an action which would cost the heat developed by combination. Again, the work done by solar radiation in dissociation must reduce the intensity of radiation; so that the brightness of the sun. stars, and planets should diminish much more rapidly than inversely as the square of the distances. M. Hirn also supports M. Faye's objections by numerical examples.-On the functions of seven letters, by M. Brioschi.-The earthquake of the Isthmus of Panama, by M. de Lesseps. The phenomena (of which he gives a scientific account) seem to have been much exaggerated. The character of comparative immunity of the isthmus (as compared with regions near) is not seriously affected; and in any case, the construction of a maritime canal without locks is justified. There is no ground for apprehension as to the banks of the canal.-M. Peligot presented a "Treatise of Analytical Chemistry applied to Agriculture," and indicated its scope.-MM. de la Tour du Breuil addressed a further note regarding their process for separation of sulphur; they have modified the process so that it is applicable either to resistant or to pulverulent ores.--On the comet observed in Chili in September, by M. de Bernardières.— On the great southern comet observed at the Imperial Observatory of Rio de Janeiro, by M. Cruls. Inter alia, he refers to the aspect of the tail as of a current of extremely bright light, in which were distinct bright lines. Behind the nucleus was a dark space, and one was reminded of a bridge-pile in a strong current. The tail extending a length of 12°, seemed suddenly interrupted, and the extension for 15° beyond was of much less width and brightness. Sodium and carbon lines were observed in the spectrum.-On the functions of the genus zero and of genus one, by M. Laguerre. -On a result of calculation obtained by M. Allégret, by M. MacMahon.-On the relation between the electromotive force of a dynamo-electric machine and its velocity of rotation, by M. Levy.-Spectrophotometric measurements of different points of the solar disc, by MM. Gouy and Thollon. They could measure separately the 200,000th part of the solar disc, and the thousandth part of the spectrum. The figures obtained show the decrease of radiation on approaching the limb (greater the more refrangible the rays). The method is also applied to spots. On the comparison of mercury thermometers with the hydrogen thermometer, by M. Crafts. Fifteen Paris thermometers examined (the crystal containing 18 per cent. lead oxide) behaved like the thermometers of ordinary glass studied by Regnault, but very unlike those of Choisy-le-Roy crystal (with nearly twice as much oxide). A German thermometer of soda glass gave a curve much nearer the mean than many others of Paris crystal.-On a hydrate of molybdic acid, MoO,2HO, by M. Parmentier.-On the transformation, in cold, of the blood of animals into solid and inodorous manure, by a new ferric sulphate, by M. Marguerite-Delacharlonny. This sulphate has the formula Fe,034SO3. With it the elimination of the water attains nearly one-half. It forms a hydrate which crystallises easily, and dissolves readily in heat. On adding a solution of the sulphate to fresh blood, the latter forms in a few seconds a firm elastic paste. It is then treated in a hydraulic press, and forms a sort of cake.-Researches on the passage of alcoholic liquor through porous bodies, by M. Gal. His experiments show the influence of the surrounding atmosphere on the alcoholic strength of liquids in bladders (an influence that has been too much overlooked). On the reduction of sulphates by living beings, by MM. Étard and Olivier. The authors proved experimentally the reduction of sulphates, by Beggiatoa, and found at least three other algæ capable of the same action.-On mono-chlorised allylic alcohol and CH2=CC1-CH, (OH) and its derivatives, by M. Henry.-Chemical studies on white beet of Silesia (continued), by M. Leplay. On the reduction of nitrates in arable land (continued), by MM. Deheraine and Maquenne. Bacillus amylobacter is probably the reducing agent,-Direct fermentation of starch; mechanism of this metamorphosis, by M. Mercano. Diastase is a product of the vital activity of the microbe of maize, which produces it incessantly as it traverses the envelopes of the starch grains, thus favouring its action on the stratified granulose. The microbe is that which causes the fermentation of sugar-cane juice.—On the role of earthworms in propagation of charbon, and on the attenuation of the virus, by M. Feltz. His experiments confirm the views of M. Pasteur as against those of M. Koch.-On the disinfectant and antiseptic action of copper, by M. Burcq. He suggests treatment of infectious diseases with salts of copper, injection of the wood of huts furniture, clothing, &c.-Analysis of the reflex of C. Loven, by with copper sulphate, also applications of copper to infected M. Laffont.-On the venomous apparatus and the poison of the scorpion, M. Joyeux-Laffuie. The poison should be placed among poisons of the nervous system (Bert) and not among blood-poisons (Jousset de Bellesme). -Researches on the genital organ of oysters, by M. Hoek. ROYAL SOCIETY, at 4.30.-On the Nerves of the Frog's Lung: Dr. W. Stirling. Notice of Portions of the Skeleton of the Trunk and Limbs of the great Horned Saurian of Australia (Megalania prisca, Ow.): Prof. Owen, F.R.S.-On the relation of particular structural Features in certain Leaves to the Phenomena of Nyctitropism and Movements incident on Stimulation by Concussion: D. Í Cunn ngham. - Note on the Discovery of Bacilli in the condensed Aqueous Vapour of the Breath of Persons affected with Phthisis: Dr. A. Ransome.-On the Cntinuity of the Protoplasm in the Motile Organs of Leaves: W. Gardiner, B. A. LINNEAN SOCIETY, at 8.-Flora of Madagascar: J. G. Baker.-Cerebral Homologies in Ver.ebrates and Invertebrates: Prof. Owen -Pass.fl ræ from Ecuador and New Granada: Dr. Maxwell Masters.-On Finsch's Fruit Pigeon: E. P. Ramsay.-Mollusca of Challenger Expedition, XVI. Rev. R. Boog Wa'son. CHEMICAL SOCIETY, at 8.-Ballot for the Election of Fellows.-Contribu tions to the Chemistry of Tartaric and Citric Acids: The late B. J. Grosjean-Contributions from the Jodrell Laboratory, Kew; (1) Consti tution of Lignin and Bastose: C. F. Cross ard E. J. Bevan. (2) Contributions to the Chemistry of Plant Fibre: C. F. Cross, E J. Bevan, and S. S. Webster. (3) Action of Nitric Acid on Cellulose: C. F. Cross and E. J. Bevan.-On the Constitution of some Bromine Derivatives of Naphthalene: R. Meldola. SUNDAY, NOVEMBER 19. SUNDAY LECTURE SOCIETY, at 4.-Metamorphoses of Insects: Prof. P. ARISTOTELIAN SOCIETY, at 7.30.-Locke to Berkeley: G. White.-Berkeley to Hume: A. M. Ogilvie. TUESDAY, NOVEMBER 21. STATISTICAL SOCIETY, at 7.45. WEDNESDAY, NOVEMBER 22. SOCIETY OF ARTS, at 8.-Ice-making and Refrigerating: Dr. Hopkinson, F.R.S. THURSDAY, NOVEMBER 23. ROYAL SOCIETY, at 4. 30. SOCIETY OF TELEGRAPH ENGINEERS, at 8.-Notes on the Telegraphs used during the Operations of the Expeditionary Force in Egypt: Lieut.-Col. Webber, R.E. FRIDAY, NOVEMBER 24. QUEKETT MICROSCOPICAL CLUB, at 8.-The Statoblasts of Freshwater Sponges: B. W. Priest. SATURDAY, NOVEMBER 25. PHYSICAL SOCIETY, at 3.-On Liquid Slabs: Dr. F. Guthrie.-On Rainbow formed by Reflected Light: W. Ackroyd. 34, C. TISLEY & Co., OPTICIANS, 172, BROMPTON ROAD, S. W. (Close to South Kensington Museum.) THE PHONEIDOSCOPE An Instrument for Observing the Colour-Figures of Liquid Films under the action of Sonorous Vibrations, Being a visible demonstration of the Vibratory and Molecular Motion of a Telephone Plate The PHONEIDOSCOPE, with 3 Discs, Bottle of Solution, Descriptive Pamphlet, &c., in Cardboard Box, 10s. 6d. MANUFACTURED AND SOLD WHOLESALE AND RETAIL BY S. C. TISLEY & CO., 172, BROMPTON ROAD, LONDON, S.W. TELEPHONIC ELECTRICITY. All Materials supplied for Experimental Purposes. Price Lists of Electrical and Acoustic Apparatus, with Drawings and Description of the Harmonograph. Post Free, 2d. CHEMICAL, CO., LONDON, W.C. PHYSICAL, AND ELECTRICAL APPARATUS, CHEMICALS and REAGENTS of the greatest Purity for ANALYSIS and CHEMICAL RESEARCH, &c. We have pleasure to announce that a new Price List of the above is now ready, and will be sent post free on application. HARVEY AND PEAK, SUCCESSORS TO W. LADD & CO., SCIENTIFIC INSTRUMENT MANUFACTURERS, BEAK STREET, REGENT STREET, LONDON, W. NEW PATENT METALLIC SENSITIVE THERMOMETERS, DIAL FORM WITH BOLD SCALE. READING SCREEN FOR PROTECTION OF SIGHT AS RECOMMENDED BY DR. BRUDNELL CARTER. PHILOSOPHICAL APPARATUS OF EVERY DESCRIPTION SUITABLE FOR LECTURES AND CLASS INSTRUCTION IN ACOUSTICS, LIGHT, HEAT, MAGNETISM, ELECTRICITY, PNEUMATICS, &c. ILLUSTRATED CATALOGUE, PRICE SIXPENCE. NOTICE OF REMOVAL. JAMES HOW & CO., SCIENTIFIC INSTRUMENT MAKERS, E. DENT & CO., Makers of the Primary Standard Timekeeper of the Only Addresses :-61, Strand, and 34, Royal Exchange, London. 8vo, cloth, price 18s. When we take up a book written by one of the foremost astronomers, mathematically and practically, of the day, we need not fear that, however popular, it will be inexact in its language or evasive in its descriptions. Nor are we disappointed in the book before us. Throughout the whole of it we are struck by the total absence of the defects so common in popular writings.... It is unlike anything else of its kind, and will be of more use in circulating a knowledge of astronomy than nine-tenths of the books which have appeared on this subject of late years."-Saturday Review. MACMILLAN & CO., LONDON. HOLLOWAYS OINTMENT A CERTAIN For BAD BREASTS, OLD WOUNDS, and SORES. If FLUIDS. EXPERIMENTAL RESEARCHES BY W. F. STANLEY. 566 pages, Double crown 8vo. 227 Illustrations, price 155. "Thoughtful and philosophical work."-Athenæum, April 1. "These researches show an amount of labour and accurate observation."Lancet, April 22 "Research of extreme difficulty treated with great skill and acumen.”— Knowledge, April 21. "Opens out a large amount of Theory in the principles of the Science of Price Sixpence. THE LIGHTNING ROD. On "THE NECESSITY FOR A REGULAR INSPECTION OF LIGHT- Mr. Richard Anderson's paper on lightning conductors was well timed, CLINICAL CASES: Case of Allochiria. By David Ferrier. M.D., F.R.S. Case of Spasmodic Rhythmical Contractions of Diaphragm, Recti, and MACMILLAN & CO., LONDON. |