148 



NATURE 



[October 16, igig 



The paper contains figures showing the change in 

 volume which talces place when two liquids are mixed 

 or when a solid is dissolved in a liquid. These results 

 are discussed, and also the change in volume which 

 results from the solution of a solid in a mixture of two 

 liquids, k much smaller contraction is observed when 

 a solid is dissolved in a mixture of water and alcohol 

 than when it is dissolved in either of the liquids 

 separately.— G. M. Bennett and E. E. Turner: Note 

 on organo-metallic derivatives of chromium, tungsten, 

 and iron. Organic compounds containing iron in 

 direct union with carbon plav an important r6\e in 

 animal and plant chemistry, and have an interesting 

 future in connection with pharmacology. .\n attempt 

 has been made to prepare such compounds, and a few 

 preliminary experiments have been carried out also 

 on similar compounds of chromium and tungsten. 



Cape Town. 

 Royal Society of South Africa, August 20. — Dr. J. D. F. 



Gilchrist, president, in the chair. — Sir Thomas Muir : 

 Note on a sum of products which involves symmetri- 

 cally the Mth roots of i. — C. v. Bonde : Note on some 

 abnormalities in the Caoe crawfish (Jasus lalandii). 

 An account was fjiven of some peculiarities observed 

 amongf specimens procured for laboratory use in the 

 Z6ological Department of the University of Cape 

 Town. 



BOOKS RECEIVED. 



A Laboratory Manual for Eleinentary Zoology. By 

 Dr. L. H. Hyman. Pp. xvi+i4g. "(Chicago. III.: 

 The University of Chicago Press ; Cambridge : Uni- 

 versity Press, 1919.) 1.50 dollars. 



A Field and Laboratory Guide in Biological Nature- 

 Study. By Prof. Elliot R. Downing. (The University 

 of Chicago Nature-Study Series.) Pp. 120. (Chicago, 

 111. : The University of Chicago Press ; Cambridge : 

 University Press, 1918.) i dollar. 



The Hydrogenation of Oils : Catalyzers and Cata- 

 lysis and the Generation of Hydrogen and Oxygen. 

 By Carleton Ellis. Second edition, thoroughly revised 

 and enlarged. Pp. xvii + 767. (London: Constable 

 and Co., Ltd., igig.) 365. net. 



The Manufacture of Chemicals bv Electrolysis. By 

 Arthur J. Hale. (A Treatise of Electro-Chemistrv.") 

 Pp. xi + 8o. (London: Constable and Co., Ltd., 1919.) 

 6s. net. 



Insect Pests and Plant Diseases in the Vegetable 

 and Fruit Garden. By F. Martin Duncan. Pp. 95-1- 

 xii plates. (London : Constable and Co., Ltd., 19 19.) 

 3.S. 6d. net. 



The Teaching of Science in the Elementary School. 

 By Gilbert H. Trafton. (Riverside Text-books in 

 Education.) Pp. x-(-293. (New York: Houghton 

 Mifflin Co.; London : Constable and Co., Ltd., 1919.) 

 6s. 6d. net. 



Problems of Cosmogony and Stellar Dynamics. Bv 

 J. H. Jeans. Pp. viii-t- 293-1- plates v. (Cambridge: 

 At the University Press.) 215. net. 



Petrology for Students. By Dr. .\. Harker. Fifth 

 edition. Pp. viiiH-3oo. (Cambridge: .\t the Univer- 

 sity Press.) Ss. 6d. net. 



The Nature of Enzyme Action. By Prof. W. M. 

 Bayliss. Fourth edition. Pp. viii-i-190. (London: 

 Longmans and Co.) ys. 6d. net. 



Kingston-upon-Hull Before, During, and After the 

 Great War. By T. Sheppard. Pp. 120. (London 

 and Hull : A. Brown and Sons, Ltd.) 



The Condensed Chemical Dictionary. Compiled 

 and edited by the Editorial Staff of the Chemical 

 Engineering Catalogue. Pp. 525. (New York : The 

 Chemical Catalogue Co., Inc.) 5 dollars. 

 NO. 2607, VOL. 104] 



Annuaire de I'Observatoire Royal de Belgique, 1920. 

 Pp. vi + 3S3. (Bruxelles : Hayez.) 



Hidden Treasure : The Storv of a Chore Bov who 

 Made the Old Farm Pay. ' Bv J. T. Sirhpson. 

 Pp- 303- (Philadelphia arid London : J. B. Lip. 

 pincott Co.) 65. net. 



Applied Economic Botany Based upon Actual Agri- 

 cultural and Gardening Projects. Bv Dr. M. T. Cook. 

 Pp. xviii-f-26i. (Philadelphia and London : J. B. 

 Lippincott Co.) ys. 6d. net. 



The Amoebae Living in Man. By Prof. C. Dobell. 

 Pp. vi-l-iS5+pIates v. (London: John Bale, Sons, 

 and Danielsson, Ltd.) ys. 6d. net. 



DIARY OF SOCIETIES. 



THURSDAV, October i6. 

 The Institution of Mining and Mr.i Ai,i.URGy, at 5.30.— C. M. Harris: 



Prospecting for Cold and Other Ores in Western Australia.— F. Danvers 



Power: Coral Island Phosphates in the Making. 

 Optical Society, at 7.30.— J. W. French : The Unaided Eye, II.— 



Chas. W. Gamble ; Projection Screens. 



TUESDAY, October 21. 



ZoOLOGlCAl. Society, at 5.30.— E. G. Boulenger : Report on Research 

 Experiments on Methods of Rat destruction at the Zoological Society's 

 Gardens.— Dr. A. Smith Woodward. Prof. F. Wood Jones, Prof. j. P. 

 Hill, Prof. A. Keith, Mr. R. 1. Pocock, Prof. G. F.liiot Smith, and 

 Others : Discussion on the Zoological Position and Affinities of Tarsiiis. 



Institution of Pktroleum Technologists, at 5.30.— Arnold Ph lip : 

 Some Laboratory Tests on Mineral Oils. 



IVEDNBSDA K, Oc roBER 22. 

 Institution of Autowobii.ic Engineers, at 8.— I'hos. Clarkson : P.^esi- 



dentiai Address. 



FRIDAY, October 24. 

 Physical Society, at 5.— Dr. N. W. McLachlan : The Effect of Pressure 



and Temperature on a Meter for Measuring ihe Rate of Flow of a Gas. 



—J. H. Shaxby : .'^ Cheap an I Simple Micro.halance.— J. W. T. Walsh : 



The Resolution of a Curve into a Number of Exponentials. 

 Institution of Mechanical Engineers, at 6. — Dr. E. Hopkinson : 



Presidential Address. 



CONTENTS. PAGE 



The Bantu Languages 129 



Our Legacy of Hope 130 



Our Bookshelf 130 



Letters to the Editor :— 



Colloid and .Saline in Shock and Cholera. — Prof. 



Benjamin Moore, F.R.S 131 



The Audibility of Thunder.— Capt. C. J. P. Cave 132 



Open-air Natural History. {Illustrated.) 132 



The Reconstruction of the Fishing Industry ... 133 



Notes 13s 



Our Astronomical Column : — 



Ephemeris of Comet 1919^ 138 



The Albedo of Saturn's Rings 138 



The Selection of Sites for Aslronomicil Observatories 138 



Forthcoming Books of Science 138 



The British Association at Bournemouth : — 



Section E— Geography — Opening Address by Prof. 



L. W. Lyde, M.A., President of the Section . 141 



University and Educational Intelligence 146 



Societies and Academies 147 



Books Received 148 



Diary of Societies . . 148 



Editorial and Publishing Offices : 



MACMILLAN AND CO., Ltd., 



ST. MARTIN'S STREET, LONDON, W.C.2. 



Advertisements and business letters to be addressed to the 

 Publishers. 



Editorial Communications to the Editor. 

 Telegraphic Address: Pnusis, London. 

 Telephone Number : Gerhard 8830. 



