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need not necessarily be alternations of transparency and opacity in

solution. This point is a minimum temperature. Besides, order to produce the desired effect. Very close contact between there are two cıyohydratic lines, representing the series of soluthe film and the grating is essential. -On atmospheric polarisa

tions which may exist with ice and A or ice and B as solids. In tion, by M. A. Hurion.-Researches on the higher alcohols

the other cases when A and B form a double salt D, there are two and other impurities in vinic alcohol, by M. Émile Gossart. - cryohydratic points, one for the solution in equilibrium with On the general relations which exist between the coefficients in ! ice + D + A, the other for ice + D + B; and three cryothe fundamental laws of electricity and magnetism, by M. E. hydratic lines for the solutions in equilibrium with ice + D, Mercadier. - On the reflection of electric waves at the end of 'ice + A, ice + B. When the double salt is soluble without a linear conductor, by M. Birkeland. - Multiplication of the decomposition, the two cryohydratic points are both minimum number of periods of sinusoidal currents, by M. Désiré Korda.

temperatures, and therefore there must exist a maximum tempeOn the hygroscopic properties of several textile fabrics, by M. Th.

rature on the line for ice + D; this maximum relates to the Schlæsing fils.-Contribution to the study of the Leclanché cell, solution which presents the same relation A/B as in the double by M. A. Ditte. -Attempt at a general method of chemical syn

salt. All these conclusions may be deduced from thermoe thesis ; formation of nitrogen compounds, by M. Raoul Pictet. dynamical rules; they were confirmed in experimental research -On the stereochemistry of the malic compounds, and the by Mr. Schreinemakers. variation of the rotatory power of liquids, by M. Albert Colson. -On a chlorobromide of iron, by M. Lenormand.-On the saccharates of lime, by M. Petit.-On a new soluble ferment

BOOKS, PAMPHLETS, and SERIALS RECEIVED. doubling trehalose into glucose, by M. Em. Bourquelot.-On

Books.-Carlsbad, a Medico-Practical Guide : Dr. E. Kleen (Putnam).

Louis Agassiz, his Life and Work: Dr. Holder (Putoam).-Die Natürliche the circulatory apparatus of Mygale Camentaria, Walck, by M. Auslese beim Menschen: 0. Ammon (Jena, Fischer). - Public Health Marcel Causard-Influence of the pressure of gases upon the Laboratory Work : H. R. Kenwood (Lewis). - Annual Statement of Works development of vegetables, by M. Paul Jaccard. - On the

carried oui by Public Works Department (Sydney, Potter). – The Principles

of Agriculture: G.Fletcher (Derby, Central Educational Company). - Science ammonite layers of the inferior Malm in the county of Monte

et Religion : T. H. Huxley (Paris, Bailllère).-Au Bord de la Mer : Dr. junta, Portugal ; little known phases in the development of the E. L. Trouessart (Paris, Baillière! - Confé ences Scientifiques et Allocu. mollusca, by M. Paul Choffat.-On the mode of reproduction

tions-Constitution de la Matère : Lord Kelvin. Traduites et Annotées of the parasites of cancer, by MM. Armand Ruffer and H. G.

sur la Deuxième Edition : P. Lugol and M. Brillouin (Paris, Gauthier,

Villars). - Premiers Principes d'Électricité Industrielle: P. Janet (Paris, Plimmer.-M. Lippmann presented to the Academy, in the Gauthier-Villars).— The Great Barrier Reef of Australia: W. Saville-Kent names of MM. Auguste and Louis Lumière, coloured photo- (W. H. Allen). graphs obtained by the interference method.

Pamphlets.-Meteorological Results deduced from Observations taken

at the Liverpool Observatory during the Years 1889, 1890 1891 (Liverpool), Berlin.

-On the Effects of Urban Fog upon Cultivated Plants : Prof. F. W. Oliver (Spottiswoode).

- The Fundamental Hypo heses of Abstract Dynamics : Physical Society, March 10.-Prof. Kundt, President, in Prot. J. G. MacGregor.- Il Clima di Torino: G. B. Rizzo (Torino, Clausen).the chair. - The President gave an account of some researches On the Application of Interference Methods to Spectroscopic Measureundertaken as an introduction to the study of Hall's phenomenon.

ments: A. A. Michelson (Washington, Smithsonian Institution).- RecreaAs is well known, this is directly proportional to the intensity of

tion : W. Odell (Torquay, Iredale).

Serials.- Journal of the Chemical Society, April (Gurney and Jackson). the primary current, but inversely proportional to the pressure Annalen des k. k. Naturhistorischen Hofmuseums, Band viii No. 1 (Wien, of the plates ; on the other hand, it is not strictly proportional Holder). — Timehri, No. xxii. (Stanford) -Notes from the Leyden Museum, to the magnetising current in the case of the several metals so

vol. xv. No. 2(Leyden, Brill).- L'Anthropologie, tome iv. No. 1 (Paris,

Masson). - Journal of the Royal Microscopical Society, April (Williams far examined, and it appeared probable that it might more pos- and Norgale):- The Asclepiad, No. 37. vol. x. (Longmans). — Records of sibly be proportional rather to the magnetisation of the plate. the Geological Survey of India, vol. xxvi. Part 1 (Calcutta). Prof. Kundt wished to test this possibility in the case of iron, nickel, and cobalt, employing transparent metallic films of these

PAGE metals magnetised to 28,000 units, whose magnetisation could

CONTENTS. be iested directly by means of their rotatory power. It was

Dynamics in Nubibus

601 found that the Hall effect increased hand in hand with the in

Vertebrate Biology. By W. N. P.

605 crease of rotatory power, and therefore proportionally to the

Our Book Shelf:magnetisation of the plates. The effect was, as Hall had already

Marilaun : “ Pflanzenleben.”—D. H. S.

605 shown, positive in the case of iron and cobalt, negative in that

Giacosa : “ Bibliografia Medica Italiana

606 of nickel. Bismuth deposited electrolytically in a transparent Letters to the Editor :

Balfour : The Evolution of Decorative Art"

606 film gave very feeble or no results, whereas, when drawn out into a thin plate the effect was considerable.—Dr. Wren spoke Palæontological Discovery in Australia.-Prof. Alfred on Maxwell's proposition that waves of light exert pressure in

Newton, F.R.S.

боб the direction of their transmission, as proved in a certain case

An International Zoological Record. -Dr. Herbert by Boltzmann. He deduced, under certain assumptions, a

H, Field

606 sórmula for the calculation of temperature based upon a deter

Lion riger and Tiger-lion Hybrids-Dr. V. Ball, mination of maximal energy.

F.R.S.

607 Soot-figures on Ceilings. (Illusirated.)–E.B. Poul. AMSTERDAM.

ton, F.R.S.; Prof. Oliver Lodge, F.R.S. Royal Academy of Sciences, March 25. — Prof. van de The Use of Ants to Aphides and Coccidæ. -T. D. A. Sande Bakhuysen in the chair.—Mr. Pekelharing spoke of the

Cockerell

608 peptone of Kühne. Some years ago he argued there was not a Blind Animals in Caves.-G. A. Boulenger. 608 real difference be! ween the substances called pept ne, and the Observations in the West Indies. By Prof. A. substance called propeptone or hemialbumose. The researches Agassiz.

608 of Kühne and his disciples afterwards proved that what was Artionyx-a Clawed Artiodactyle. (With Diagrams.) called peptone by Schmidt-Mülheim and by Salkowski, con- By Prof. Henry S. Osborn

610 tained albumose. But it was not proved hy Kühne that the The Hodgkins Fund Prizes. By Prof. S. P. Langley 611 substance called by himself peptone was really free from albu- The Solar Eclipse

611 mose. Out of a solution of Kühne's peptone, salurated

Nes

612 with ammoniumsulphate, there can be precipitated by meta- Our Astronomical Column:phosphoric acid, and more fully by trichloracetic acid, a sub- Large Telescopes

616 stance which has the properties of albumose. It gives the Spectrum of B Lyræ .

616 biuretreacıion, it is precipitated, the reaction may be acid, Société Astronomique de France

616 neutral, or alkaline, by ammoniumsulphate, it is precipitated hy Wolsingham Circular, No. 34

616 picrinic acid, and, in acid solution, by saturation with natrium | Astronomical Journal Prizes

616 chlorid. So it is clear that there is no ground for believing Geographical Notes with Kühne that the substance called by him peptone is a sub- Institution of Mechanical Engineers

617 stance sui generis, and not an impure albumo.e. -Mr. Bahhuis Coni'ers. By G. N.

619 Roozeboom dealt with the cryohydrates in systems of two salts. The Earthquakes in Zante

620 Three cases are to be considered. The first is that the iwo salts Scientific Serials

620 may exist without combination. Then there is a cryohydratic Societies and Academies

621 point in which the two salts A and B exist with ice next the Books, Pamphlets, and Serials Received

624

608

617 NEW WORK BY PROFESSOR MILNES MARSHALL.

Now Ready. Super-royal to, with 16 Chromo Plates, and 48 Plates in Photomezzotype.

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THE GREAT BARRIER REEF OF AUSTRALIA :

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Author of “A Manual of the Infusoria." The Great Barrier Reef of Australia, represented by a vast rampart of coral origin, extending for no less a length than twelve hundred miles from Torres Straits to Lady Elliot Island on the Queensland coast, takes rank among the most notable of the existing wonders of the world. Built up by the direct and indirect agency of soft-feshed polyps of multitudinous form and colour, it encloses betwixt its outer border and the adjacent mainland a tranquil ocean highway for vessels of the heaviest draught. To the naturalist, and more particularly to the marine biologist, the entire Barrier area is a perfect Eldorado, its prolific waters teeming with animal organisms of myriad form and hue representative of every marine zoological group:

'The author's qualifications for the task he undertakes are emphasised thruugh the circumstance of his having been occupied for the past eight years as Inspector and Commissioner of Fisheries to various of the Australian Colonies, the three later years having been devoted more exclusively to investigating and reporting to the Queensland Government upon the fishery products of the Great Barrier District.

A prominent feature in this work will consist of photographic views of coral reefs of various construction and from diverse selected localities, together with similar and also coloured illustrations and descriptions of the living corolla, coral polyps, and other marine organisms commonly associated on the reefs. These photographic illustrations taken by the author are, from both a scientific and an artistic standpoint, of high intrinsic merit and also unique in character, representing, in point of fact, the first occasion on which the camera has been employed for the systematic delineation of these subjects. London : W. H. ALLEN & CO., LTD., 13 Waterloo Place,

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DENT'S MICROSCOPE is suitable for investigations
with the highest powers. The quality and Workman-
ship are the finest possible, and it is unequalled for
stability and convenience of Manipulation by any other
medium size or Student's Instrument. Price from

£ 5s.
WATSON & SONS' VAN HEURCK MICROSCOPE

combines every Mechanical Convenience with the utmost Precision in all the Working parts and is Unsurpassed for Photo-Micrography and all Research

of the most delicate nature. WATSON & SON'S perfected form of FINE ADJUST

MENT, giving the greatest delicacy of mtion, without lateral movement, is fitted to all their instrument.

OPTIMUS"

PHOTOGRAPHIC WRITE FOR OUR CATALOGUE. IT IS SENT POST FREE. “OPTIMUS ” UBIQUE CAMERA.

Pictures 4 by 34 inches.
May be used on Tripod or in hand.

s printed by RICHARD CLAY AND SONS, LIMITED, at 7 and 8 Bread Street Hill, Queen Victoria Street, in the City of London, and Published by

MACMILLAN AND Co., at 29 Bedford Street, London, W.C., and 112 Fourth Avenue, New York. -THURSDAY, April 27, 1893.

Price, with
Rapid View

Lens,
£2 15s.

With Rapid
Rectilinear,

£4.

PERKEN, SON, & RAYMENT,

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"OTTO"

Carries six dry

plates. Three dark

slides, Focussing

Screen, View Finder, Shutter,

&c.

CROSSLEY'S

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