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W. WILSON. STUDENT'S SPECTROMETER.

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Telescope and prism table reading to I min.; clamp and fine adjustment to both. Rack-motion to telescope; prism table adjustable vertically and horizontally. Adjustable slit to colli. mator. Protected

circle. In case. Price

£6 0 0 A very large number of these instruments have been sold,

and have given exceptiona satisfaction. 1 BELMONT STREET, LONDON, N.W. See illustrated article, "Invar and its Applications,"

" Nature," December 8, 1904. IN VAR The Alloy of Nickel Steel which has an extremely

small Coefficient of Expansion. BASE-LINE MEASURING APPARATUS, PENDULUMS, BALANCES

FOR WATCHES AND CHRONOMETERS. N.B.-Invar Pendulums are not made by old-fashioned methods, rule ur thumb, or trial and error. Instead of looking up the coefficient of ex. pansion in a book, the actual coefficient of expansion of every melting of Invar is specially measured at the National Physical Laboratory, also that of the Alloy used for the bobs. The calculations are made by one of the post distinguished mathematicians in England (D. Sc., London, &c., &c.). The result is that each pendulum will give accurate results from the first. The First Grade Pendulums are made from material, individually tested and calculated throughout.

Apparatus for the HURTER & DRIFFIELD

Method of Speed Determination, Exposing apparatus for im. pressing a series of exposures upon a plate, consisting of ma. hogany case fitted with sliding shutter in front and special form of single dark slide on door at back; accurately cut sector in accordance with Messrs. Hurter & Driffield's specification, 12-in. diameter, impressing nine posures on the plate, mounted on steel axle running in long gun metal bearings, driving pulley, complete, dull black celluloid rinish, inside and out,

complete as shown, £5. The CHAPMAN JONES Patent Plate Tester.

(SANGER-SHEPHERD & CO., Sole Makers.) A simple instrument for testing photographic plates

10 n 20 2 and films; examination of plate shows: (1) Sensitive.

12 ness or Speed ; (2) Range

22

19 of Gradation ; (3) Possible

GREY range of Exposure ; (4)

18 Colour Sensitiveness : (5)

13

23 Grain ; (6) Halation ; (7) Most suitable Dark-room

14 17 24 Light, &c. Instrument complete,

nenapmajones comprising 45 x 3! Screen

PLATE TESTER 15 16 25

Sanger Shepherdaco plate, special dark slide, exposure board, folding candle shade, adjustable candle holder, and standard candle, in neat case with book of working instructions, 376. IT Send for New Booklets, post free to readers of Nature.'

CO., 5, 6 7 GRAY'S INN PASSAGE, RED LION STREET,

HOLBORN, LONDON,

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J. H. AGAR BAUGH, 92 Hatton Garden, London, E.C. SANGER-SHEPHERD

Telegraphic Address : "Voider, LONDON."

Telephone : No. 4722 Holborn.

LANTERN and

ON SALE.
MICROSCOPICAL SLIDES
In all branches of NATURAL HISTORY, from 6/- per dozen.

Astronomical Telescope, by DOLLOND, 4" Object Glass, on Altazi-
Over 20,000 in Stock

muth Stand, 4 Eyepieces, £21'; 3t" ditto for £10.- Petrological Micro (As supplied to the Principal Universities, Technical Schools, &c.)

scope, by WATSON, cost 613, offered £6 6s.-Portable Microscope, Send for Catalogues to the actual preparers.

by BECK, . in pigskin case, cost $10, offered £4 10s.-WATSON'S FLATTERS & GARNETT, Ltd.,

! " Fram," in spotless condition, with Substage Abbe Condenser, 2 Eye. Dealers in everything Microscopical, 48 Deansgate, Manchester.

pieces, and 3 Objectives, all by WATSON, 1", ?", & 1" Oil Immersion offered

at £11.-Student's Microscope, by BAKER, with 1" and " Objectives. LABORATORIES: 16 & 18 CHURCH ROAD, LONGSICHT, M/C.

£4 10s.- Another, standard size, by WARD, of Manchester, with 1 N.B.-Special Series of 48 Microscopical Slides for Students of and t", for £2 5s. - Prismatic Binocular, gx, by VOIGTLANDER, for Botany, in box, 21/- net. Book of Original Diagrams illustrating £5.-21" Telescope, in sling case, by WATSON, for £3.-Second-hand this Series, 1/- net.

Cabinets, for Entomological and Petrological Specimens and Birds' Eggs LANTERNS, MICROSCOPES, NATURE STUDY appliances, &c.

at very low prices. First-class Optical Lantern, fitted for ordinary PHOTO-MICROGRAPHIC APPARATUS. LEACH'S LANTERN MICROSCOPE. work and for Science Demonstrations, £3 10s.- Particulars on applica Speciality. LANTERN SLIDEs from Negatives, Book Illustrations, &c. tion.-Cheap Microscope Slides. Correspondence invited.

Rev. H. MILLS, Greenside, Kendal.

ELECTRICAL and EXPERIMENTAL TO SCIENCE LECTURERS. HUGHES' PHOTO • ROTOSCOPE CINEMATOGRAPHS. THE MOST PERFECT. No Flickering. Superb Mechanism.

H. HELM, Price £7 7 0. The Moto-Photo Camera for taking the Pictures.

66 HATTON GARDEN, LONDON. Illustrated Lists, 2d.

Glass Blower & ACTUAL MAKER of all kinds of X-Ray and

VACUUM TUBES, Glass Instruments, Mercury Pumps, &c. See Mr. HUGHES' PATENT COMBINATION OPTICAL LANTERN,

Any kind of Glass Apparatus made from sketch, or &c. Miniature Triple Lantern constructed for B. J. MALDEN, Esq. ; great

repaired, for Scientific Men and Laboratories. success. New Oxybydrogen Microscope. Science Lanterns for Class De.

Lessons and Performances given here, or at Colleges, &c. monstration. Magnificent Results. Docwra Triple, Prize Medals, Higbest Award. Supplied to the Royal Polytechnic Institution, Dr. H. GRATTAN

THE IRISH NATURALIST. GUINNESS, &c. Patent Pamphengo Science Lanterns. The Universal Lantern 4-inch Condensers, 4-wick Lamp, Portrait Combination front A Monthly Magazine of Irish Zoology, Botany, and Lenses, 185. 6d. Marvellous value. Science Lecture Sets. Novelties.

Geology. Price 6d. The Lantern Kaleidoscope. Cheapest Lantern Outfits in the World.

Edited by GEO. H. CARPENTER, B.Sc., and R. LLOYD Grandly Ilustrated Catalogue, over 180 choice Engravings, 6d.;

PRAEGER, B.A. Postage, 4d. Small Illustrated Catalogue, 100 pages, free, 5d. List of 60,000 Slides and 300 Lecture Sets, Science Subjects, Views, &c., 6d.;

Annual Subscription, 55. Post Free to any Address. Postage, 2d. Pamphlets Free. W. C. HUGHES, SPECIALIST,

Dublin : EASON & SON, LTD., 40 Lower Sackville Street Brewster House, 82 Mortimer Road, Kingsland, N.

(to which Address Subscriptions should be sent). i London : SINPKIN, MARSHALL, HAMILTON, KENT, & CO., Ltd

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GLASS BLOWING.

NA TURE

SERIES.

75. 6d.

45. 6d.

Crown 8vo.

Crown 8vo. POPULAR LECTURES and AD. The CHEMISTRY of PHOTODRESSES.

GRAPHY. By Lord KELVIN, F.R.S. In Three Vols.

By Prof. R. MELDOLA, F.R.S. Illustrated. 6s. Vol. I. THE CONSTITUTION OF MATTER. · TIMBER, and some of its DISEASES. Second Edition. 75. 6d.

By Prof. H. M. WARD, M.A. Illustrated. 6s. Vol. II. GEOLOGY AND GENERAL PHYSICS.

DISEASE IN PLANTS. Vol. III. PAPERS ON NAVIGATION. 75. 6d.

By Professor H. M. WARD, M.A. 75. 6d. On LIGHT.

FLOWERS, FRUITS, and LEAVES. The Burnett Lectures. By Sir GEORGE GABRIEL

By Lord AVEBURY, F.R.S., D.C.L., LL.D. Illustrated. STOKES, F.R.S. Three Courses. I. ON THE NATURE of Light. II. On Light AS A MEANS OF INVESTIGA

ON BRITISH WILD FLOWERS, TION. III. ON BENEFICIAL EFFECTS OF Light. 7s. 6d.

CONSIDERED in RELATION SOUND: a SERIES of SIMPLE, to INSECTS. ENTERTAINING, and INEX

By Lord AVEBURY, F.R.S., D.C.L., LL.D. Illustrated. PENSIVE EXPERIMENTS. THE ORIGIN and METAMOR By A. M. MAYER. 35. 6d.

PHOSES of INSECTS.

By Lord AVEBURY, F.R.S., D.C.L., LL.D. With MODERN VIEWS of ELECTRICITY. Illustrations. 35. 6d. By Sir 0. J. LODGE, LL.D. Illustrated. 6s. 6d. ARE THE EFFECTS OF USE AND

DISUSE INHERITED? A CENTURY of ELECTRICITY.

An Examination of the View held by Spencer and Darwin. By T. C. MENDENHALL. 45. 6d.

By W. PLATT BALL. 35. 6d.

45. 6d.

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WE HAVE RECEIVED THE FOLLOWING

RADIUM "CLOCKS.” CALCI | METAL

"

Having made a special study of these instruments, we are in a position to supply :

1. FOR THE LECTURE TABLE

(AS ILLUSTRATED). 2. FOR LANTERN

SLIDE USE .

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(In bars averaging 4, 8, and 16 oz. each),

1/6 per oz.

Post Free within U.K. Titanium metal.

Caesium oxide. Lithium

Cerium Selenium

Glycinum Tellurium

Didymium Silicium

Lanthanum Thallium

Ytterbium Zirconium

Yttrium Uranium

Rubidium Vanadium

Erbium Rhodium

Neodymium Indium

Samarium Tantalium

Praseodymium , Platin.-Magnes. cyan,

Platin.-Thorium cyan.
Lith.-Rubid.

Potass.
Cobalt

Qad'olin: oxalat:
Ammon.

Lithium fluor silicate.
PRICES ON APPLICATION.
We are prepared to quote special rates for SODIUM

and POTASSIUM in quantities.

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Discharging every 40 to 100
seconds according to quantity

of Radium. PRICES will be quoted by

return post. Kindly Note.- We cannot send these clocks by parcel post nor

lend them on hire.

We make a special feature of CHEMICALS and APPARATUS of all kinds.

PRICE LIST FREE.

RADIUM BROMIDE

of highest power manufactured.

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Goods may be returned if not approved of, when money will be refunded. Professional Men, Universities, Schools, &c., allowed special terms.

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Accurate and

Inexpensive.

ARMBRECHT, NELSON & CO., 71 & 73 DUKE ST., CROSVENOR SQUARE, W.

COX'S LARCE INDUCTION COILS

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page 23a Jan. 5. 1995, I See" NATURE,"

Up to 60 ins.

spark.
(20 ips. from

stock.)

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PIESMIC BAROMETER.

23

Descriptive

To be obtained of all Opticians, or Pamphlet

the SOLE MAKERS, Post Free.

F. DARTON & CO.,

CLERKENWELL OPTICAL WORKS, 142 ST. JOHN STREET, LONDON, E.C.

FOR SALE. 30 moving coil ammeters and voltmeters. 6 moving coil reflecting and pointer galvanometers.

8 hot wire ammeters and voltmeters. 50 electromagnetic ammeters and voltmeters. 60 dynamos and motors, direct and alternating current. 40 ironclad regulating rheostats. 20 transformers and choking coils. 10 induction coils, 10-inch spark.

3 mercury jet breaks. Standard condensers, Wheatstone bridges, static machines,

switches, cables, &c., by various makers, at low prices. G. BOWRON, 57 EDGWARE RD., LONDON, W.

For SCIENTIFIC RESEARCH

WORK & RADIOGRAPHY. With adjustable condenser and primary, and (if desired) wound on the multisectional principle.

JUST OUT. NEW PORTABLE HIGH FREQUENCY

APPARATUS.
Registered design-giving genuine High

Frequency Currents.
Price with Accumulator, £10 10 0.

HARRY W. COX, Ltd.,

ACTUAL MANUFACTURERS, 1a ROSEBERY AVENUE, & 15-21 LAYSTALL ST., LONDON, E.C.

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THE NEW "STUDENT'S” STANDARD BAROMETER.

(Rd. No. 420,297.) This Instrument has been designed to meet the re. quirements of Students and others who find the need of a Barometer which will give exact readings, and cost but a moderate sum.

It appeals especially to Colleges and Schools for Demonstration purposes.

The construction is on that of the well-known" Fortin" principle. The level of the cistern mercury is reducible to zero, in exactly the same manner as in the more expensive forms.

The diameter of the mercurial column is .25 inch, and affords a bold, well-defined reading. The scales, by means of the double vernier, are capable of being read to 'or inch and 1 millimetre. It is mounted on a wellpolished, solid mahogany board, with plates for attachment to wall, opal glass reflectors for reading off, and screws for vertical adjustment.

The metal portions are all well bronzed and lacquered, and the scales are silvered brass. We confidently recommend this Instrument for use as

Standard" in Colleges and Schools, private Observa tories, and by Gas and other Engineers. Price, complete, mounted as illustrated,

£3 7 6 each, or may be had with one scale (either inches or milli. metres), and with thermometer on other scale, at same price.

IF NATURE says :-"Provides an accurate instru. ment at a moderate cost."

FULL SIZE STANDARD BAROMETER O same design, bore o's" diameter, inches and millimetre scales, verniers reading to o'co2 inch and o'r m/m, on polished mahogany board with brackets and opal glass reflectors, £7 10 0 Sole Manufacturers and Proprietors of the

Registered Design.

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2

LANTERN ONLY.

NERNST BURNER, extra, rom 19/6.
LIME-LIGHT BURNER, extra, from 7/6.
ARC LAMP, extra, from 30/-

Delivery froin Stock.
The above Lantern can be supplied fitted complete as a
STROUD & RENDELL LANTERN, all in Metal or Wood,
complete with Prisms, £8.

PASTORELLI & RAPKIN, LTD.

Write for Particulars, also Catalogue of Lantern Slides.

46 HATTON GARDEN, LONDON, E.C. WHOLESALE MAKERS OF ALL KINDS OF METEOROLOGICAL INSTRUMENTS.

Contractors to H.M. Government. Estd. 1750. Telegrams," kapkin, London." Telephone, 1981 Holbera

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SARDINIA ST., LONDON, W.C.

313

a

THIS

THURSDAY, FEBRUARY 2, 1905.

late conception, immortality, and a belief in a personal God. A book with so large a purview is bound to be

sketchy--and the author calls it " a biological sketchTHE QUINTESSENCE OF HAECKELISMUS. book "—but sketchiness in dealing with subjects so The Wonders of Life. A Popular Study of Biological momentous is apt to be unsatisfactory, and, while Philosophy. Supplementary volume to “The Riddle

Haeckel continually and quite fairly refers to what of the Universe." By Ernst Haeckel. Translated

he has said elsewhere in his large family of books, the by Joseph McCabe. Pp. xiv + 501. (London :

discriminating reader may justly complain that he

has often to deal rather with an assertion of convicWatts and Co., 1904.) Price 6s. net.

tions than with a reasoned argument. What carries 'HIS new book by the indefatigable Haeckel is

one on from page to page is the feeling that we have to supplementary to his “Riddle of the Universe."

listen to a veteran who is telling us frankly and fearThat several hundred thousand copies of the “ Riddle

lessly what he believes to be true in regard to the order were sold indicates the widespread interest taken in

of nature and our place in it. what the author calls “the construction of a rational

From one point of view Haeckel's discussion of the and solid philosophy of life,” or in what others would

“ Wonders of Life” is an apology for “ Monism" or call an extremely biological way of looking at things.

Hylozoism." In studies of “ unequal value and inBut the “ Riddle" and its solutions raised storms of criticisms and evoked hundreds of reviews--both complete workmanship," as the illustrious author con

fesses, an attempt is made to show how we may attain friendly and hostile-besides many large pamphlets

to the conception of one great harmoniously working and even a few books, not to speak of more than five

universe" whether you call this Nature or Cosmos, thousand letters. To these collectively, friends and foes alike, Haeckel now replies in this " biological which is not of empirical origin and a posteriori. We

World or God "--without utilising any knowledge sketch-book," written uninterruptedly in the course of

must not allow metaphysical fictions to intrude on our four months when he was completing his seventieth year in a vacation at Rapallo, a tiny coast-town of the philosophy,still less into our science; we may work

with the “ law of substance,” but there is to be no Italian Riviera. He had leisure there to think over all the views on organic life which he had formed in hocus-pocusing with transcendental formulæ ; science

is sufficient unto herself, and is justified of her children; the course of a many-sided experience of life and learning since the beginning of his academic studies (1852) of time when there is so much to do; psychology is

criticism of her postulates and categories is a waste and his teaching at Jena (1861). The constant sight of the blue Mediterranean, the animal inhabitants of

a branch of physiology,” and it is unprofitable to

think about thinking; a which he knows so well, his solitary walks in the wild

theory of knowledge” is

a luxury for the leisured. Everything seems to begorges of the Ligurian Apennines, and the moving

come plain sailing if we embark the craft spectacle of the “ forest-crowned mountain altars, inspired him with a feeling of the unity of living the gangway.

Hylozoism,” but we require faith to help us across nature-a feeling that only too easily fades away in

From another point of view Haeckel's book may be the study of detail in the laboratory.” He hopes that

taken as an expression of the outlook on man and his readers may be moved by his book “ to penetrate

nature which may be reached by a conscientious purdeeper and deeper into the glorious work of Nature,

suit of the scientific method. Those who remain and to reach the insight of our greatest German natural philosopher, Goethe:

agnostic or positivist in regard to either monism or

dualism in any of their forms will be interested in * What greater thing in life can man achieve

hearing once more of the order, unity and proThan that God-Nature be revealed to him?"

gressiveness of nature's tactics, and in considering The work is described as a popular study of the practical proposals which a thorough-going biological philosophy ''; it is divided into four sections Darwinian has to offer in regard to incapables and --methodological, morphological, physiological, and incurables, pauperism and crime. We cannot do more genealogical, which deal respectively with the know- than remark that these proposals preach elimination ledge of life, the nature of life, the functions of life, rather than eugenics; they are more akin to surgery and the history of life. It raises no end of perplexing than to preventive medicine. Much of the book is, problems --life and death, nutrition and reproduction, naturally enough, an echo of previous works--the heredity and variation, sensation and intelligence, Monera,” the “ Gastræa Theory,” the " Natural morality and religion. It discusses protoplasm and History of Creation,” the “ Evolution of Man,” and, the cell, spontaneous generation and evolution in what has always appeared to us the author's magnum general, the “pro-morphology" of organisms and the opus, the “ Generelle Morphologie" (1866); but all intricate architecture of the brain, the recapitulation has been modernised and orientated afresh to illustrate of phylogeny in ontogeny, the inheritance of acquired | what Haeckel was so much impressed with at Rapallo, characters, the evolution of sensation, æsthesis, intelli- the unity of living nature. An interesting illustration gence, and morality. In short, it comprises practically of the author's artistic enthusiasm and indifference to everything, including miracles, the religious thoughts popularity will

be found in the pages

proof Mr. Romanes, the university curriculum, the in- morphology, wherein he discusses the architectural crease of pauperism, the introduction of Spartan symmetries of organisms, as he did forty years ago. elimination-methods, the Apostles' Creed, the immacu- | The centrostigmatic, centraxonial, and centroplane NO 1840, Vol 71]

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