6o 



NATURE 



[March 15, 191 7 



anhydrous aluminium bromide, followed by fractional 

 distillation. The mean density found was 36440 grams 

 per litre. — H. Hubert : Preliminary sketch of the 

 geolog>- of Senegal. — P. Fallot : "The tectonic of 

 Ibiza. — E. Belot : The satellite hypothesis and the 

 orogenic problem. — H. Devaux : Cultural methods pro- 

 ducing an increase in the production of wheat. — L. 

 Roule : The larval and post-larval development of the 

 fishes of the genus Mugil. — A. Berthelot : Re- 

 searches on the production of phenol by micro-organ- 

 isms. An organism, named B. phenolo genes, has been 

 isolated from the intestinal flora of man w^hich is 

 capable of producing about ten times as much phenol 

 as the most active phenol-producing specie'? hitherto 

 known. With tyrosine as nutrient, a concentration of 

 800 mg. of phenol per litre is produced. — M. 

 Tonzes-Diacon : The formation of turbidity in wine. — 

 V. Raymond and J. Parisot : Trench feet. The authors 

 give evidence that this condition is due to an in- 

 fection by one or more moulds. 



BOOKS RECEIVED. 



Natural Health versus Artificial Health. By Satis 

 Chandra Lahiri. Pp. vi4-i2o (Calcutta: J. Chandra 

 Adhikari.) 8 annas 



Science and the Nation : Essays by Cambridge 

 Graduates, with an Introduction by the Rt. Hon. 

 Lord Moulton Edited by A. C. Seward. Pp. xxii+ 

 328. (Cambridge : At the University Press.) 5s. net. 



Kodak Bromide Pictures. By Some Who Make 

 Them. Introduction by W. L. F. Wastell. Pp. 64. 

 (London : Kodak, Ltd.) 



The Principles of Plant-Teratology. By W. C. 

 Worsdell. Vol. ii. Pp. xvi+296 + 26 plates. (London: 

 Ray Society.) 



Germany's Lost Colonial Empire and the Essentials 

 of Reconstruction. By J. H. Harris. Pp. vii+88. 

 (London : Simpkin and Co., Ltd.) js. net. 



DIARY OF SOCIETIES. 



THURSDAY, March 15. 



RoVAL SociF.TV, 314.30.— The Initial Wave Resistance of a Moving Sur- 

 fart Pressure: Prof. T. H. Havelock.— Exp* rments with Mercury jets, 

 (i) The Relation between the let-length and the Veloc'tv of i- fflux ; 

 (j) A Comparison witri Jets of Other Liquids : Pr,>f. S. W. J. Smith and 

 H. Moss. — The Mode of Approach to Zero of the Coefficients of a 

 Fourier Series: Prof.W. H. Young —The Dissipation of Energy in the 

 Tides in Connection with the Acceleration of the Moon's Mean Motion : 

 R. O. Street. 



Royal Institution, at 3.— Sponges : a Study in Evolutionary Bioloay : 

 Prof. A. Dendy. 



Royal Society oi- Arts, at -1.30.— H he In-^ustrial and Economic Develop- 

 ment of Ind'an Forest Products : R. S. Pearson. 



LiNNEAN Society, at 5.— The Preparation of Plants for Exhibition: 

 C. E. Jones.— .\ Systematic Study of the North American Melanthaceae 

 from the Genetic Standpoint : Dr. R. R. Gates. 



FRIDAY, March 16. 

 Royal Institutiom, at 5.30.— Scientific Forestry for the United King- 

 dom : Sir J. Stirling Maxwell. 

 Institution of Mechanical Enginfers, at6.-Heat Treatment of Large 

 Forcings : Sir W. Beardmore, Bart.— Heat Treatment of Steel Forgings : 

 H. H. Ashdown. 



SATURDAY, March 17. 

 Royal Institution, at 3.— Imperial Eugenics : Saving the Future : Dr. 

 C. W. Salreby. 



MONDAY, March 19. 

 Royal Society of Arts, at 4.30.— Memorials and Monumen-s : L. 



Weaver. 

 Royal Geographicai: Society, at 5.30.— Palestine ; its Resources and 



Suitability for Colonisation : Dr. F.. W. G. Masterman. 

 Victoria Institute, at 4-3o-— The "Significance of the Geography of 



Palestine : Sir Charles Warren- 



TUESDAY, March 20. 

 RovAL Institution, at 3.— Geological W'ar Problems: Prof. J. W- 



Gregory. 

 Royal Statistical Society, at 5.15— How to Improve our Fishing 



Industries : The Right Hon. The Earl of Dunraven. 

 MineraLogical Societv, at 5.30.— The Basaltic Rocks of Spitshersen and 



Franz Joseph Land in Relation to the Brito-Arctic Province : A. Holmes, 



NO. 2472, VOL. 99] 



with Analyses by Dr. H. F. Harwood. — A General Proof of the Limita- 

 tion of the Symmetry-numbers of Crystals : Dr. J. W. Evans. — The 

 Numerical Relation between Zones and Faces of a Polyhedron: Pro'. 

 E. S. Fedorov. — The Crystallisation of Parahopeite : A. Ledoux, T. L. 

 Walker, and A. C. Wheatley. 



Zoological Society, at 5.30. — The Prechordal Portion of the Chondro- 

 cranwinx o{ Chiiiiaoa coliiei : E. Phelps Allis, jun. — A Sketch Classifica- 

 tion of the Pre-Jurassic Tetrapod Vertebrates: D. M. S. Watson. 



Institution of Civil Engineers, at 5.30. — The New Electric Power- 

 house at Birchills, Walsall : E. M. Lacey. 



Institution of Pf-troleum Technologists, at 8. — Sulphur in Petroleum 

 Oils: Dr. F. Mollwo Perkin. 



IVEDNESDAY, March 21. 

 Royal Society of Arts, at 4.30. — Colour Printing, and Some Recent 



Developments : G. W. Jones. 

 Royal Meteorological Society, at 5. — The Formation of Mist and 



Fog : Major G. 1. Taylor. 

 Entomological Societv, at 8. 

 Royal Microscopical Society, at 8. — Bateriology of War Wounds: 



Kenneth Goadby. 



THURSDAY, March 22. 

 Royal Society, at 4.30. — Probable Paper: Observations and Experiments 



on the Susceptibility ,and Immunity of Rats towards Jensen's Rat 



Sarcoma : J. C. Mottram and Dr. S. Russ. 

 Royal Institution, at 3.— Modern Improvements in Telegraphy and 



Telephony : Prof. J. A. Fleming. 

 Royal Geographical Society, at 5. — Modern Methods of Finding the 



Latitude with a Theodolite : Dr. J. Bell. 

 Institution of Electrical Engineers, at 8. — Machine Switching Tele- 

 phone Gear : F. R. McBerty. 



FRIDAY, March 23. 

 Royal Institution, at 5.30.— Magic in Names : E. Clodd. 



SATURDAY, March 24. 

 Royal Institution, at 3. — Russian Idealism : S. Graham. 



CONTENTS. PAGE 



Hunger and Appetite. By Prof. W. M. Bayliss, 



F.R.S. 41 



Theoretical and Practical Physics. By H. S. A. . . 41 

 The Technology of Typographical Printing Sur- 

 faces 42 



Is Variation a Reality? By Prof. W. Bateson, 



F.R.S 43 



Our Bookshelf 44 



Letters to the Editor: — 



Thermodynamics and Gravitation. — ^J. L. ; Prof. 



E. H. Barton, F.R.S 44 



Floating Earths. — Dr. Walter Leaf 45 



Scientific Aspects of Fuel Economy. By Prof. John 



W. Cobb 45 



The Septic Problem in War 48 



Notes 50 



Our Astronomical Column :— 



Eclipse Test of Einstein's Theory of Gravitation ... 54 



The Variable Nebula N.G.C. 2261 54 



The Chemical Engineer 54 



High-speed Telegraphy 55 



Heredity and Disease. By G. H. C 55 



The U.S. National Research Council 56 



University and Educational Intelligence 57 



Societies and Academies 58 



Books Received 60 



Diary of Societies 60 



Editorial and Publishing Offices : 



M.ACMILLAN 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 : Phusis, London. 

 Telephone Numbfr : Gerrard 8830. 



