220 



NATURE 



[May 15, 1919 



Dizionario Internazionale di Aeronavigazione e 

 Costruzioni Aeronautiche. Italiano, Francese, Inglese, 

 Tedesco. By M. Dander. Pp. vii + 227. (Milano : 

 U, Hoepli.) 6.50 lire. 



A Practical Handbook of British Birds. Edited by 

 H. F. Witherby. Part ii. Pp. 65-128+3 plates. 

 (London : Witherby and Co.) 45. net. 



The Theory of Heat. By Prof. T. Preston. Third 

 edition. Edited by Prof. J. R, Cotter. Pp. xix + 840. 

 (London : Macmillan and Co., Ltd.) 25s. net. 



Text-book of Embryology. Vol. ii., Vertebrata with 

 the exception of Mammalia. By Prof. J. Graham 

 Kerr. Pp. xii + 591. (London: Macmillan and Co., 

 Ltd.) 315. 6d. net. 



Manual of Tree Diseases. By Dr. W. H. Rankin. 

 Pp. xx+398. (New York : The Macmillan Co. ; 

 London : Macmillan and Co., Ltd.) 12s. 6d. net. 



Our National Forests. A Short Popular Account of 

 the Work of the U.S. Forest Service on the National 

 Forests. By Dr. R. H. D. Boerker. Pp. lxix+238. 

 (New York : The Macmillan Co. ; London : Mac- 

 millan and Co., Ltd.) \2s. 6d. net. 



The Mycetozoa : A Short History of their Study 

 in Britain. By G. Lister. Pp. 54. (Essex Field 

 Club Special Memoirs, vol. vi.) (Stratford : Essex 

 Field Club; London: Simpkin, Marshall, and Co., 

 Ltd.) 35. net. 



Boiler Chemistry and Feed-water Supplies. Bv 

 J. H. Paul. Pp. ix+242. (London: Longmans and 

 Co.) 145. net. 



Text-book of Physical Chemistry. By Prof. A. T. 

 Lincoln. Pp. viii-H547. (London : G. G. Harrap 

 and Co., Ltd.) 125.. 6d. net. 



A Text-book of Physiology. By Drs. M. Flack and 

 L. Hilh Pp. viii + Soo. (London: E. Arnold.) 255. 

 net. 



Les Applications de la Physique Pendant la Guerre. 

 By H. Vigneron. Pp. viii+322. (Paris : Masson et 

 Cie.) 7 francs net. 



Cotton Spinning. By W. Scott Taggart. Vol. i.. 

 Including all Processes up to the End of Carding. 

 Sixth edition. Pp. liii + 322. (London: Macmillan 

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



The Newer Knowledge of Nutrition : The Use of 

 Food for the Preservation of Vitality and Health. 

 By E. V. McCollum. Pp. ix+199. (New York: The 

 Macmillan Co.; London: Macmillan and Co., Ltd.) 

 6s. 6d. net. 



DIARY OF SOCIETIES. 



THURSDAY, May 15. 



RovAL Institution, at 3.— Prof. F. Keeble : Intensive Cultivation. 



RovAL Society, at 4.— Election of Fellows.— At 4.30.— Prof. W. H. 

 young: (1) The Area of Surfaces; (2) Change of the Independent 

 Variables in a Multiple Integral.— Prof. W. A. Bone and R. T. Sarjant : 

 Researches on the Chemistry of Coal. I. The Action of Pyridine upon 

 the Coal Substance.— Prof. E. F. Burton : A New Method of Weighing 

 Colloidal Particles.— W. E. Curtis: The Value of the Rydberg Constant 

 for Spectral Series. 



Royal Sociktyof Arts, at 4.30.— Prof. H. E. Armstrong : Soil Deficiencies 

 in India, with Special Reference to Indigo. 



Mathematical Society, at ■;.- G. N. Watson : Zeros of Lommel's Poly- 

 nomials. —\V. H. Young : The Triangulation Method of Defining the 

 Area of a Surface. 



Institution of Electrical Engineers, at 6.— E. A. Laidlawand W. H. 

 Grinsted : The Telephone Service of Large Cities, with Special Reference 

 to London. 



Chemical Society, at 8.— B. Blount and J. H. Seaueira: "Blue John" 

 and other Forms of Fluorides.— G. M. Bennett : The Nitration of Diphenyl- 

 ethylenediamine.— D. L. H.Tmmick : The Destruction of Picric Acid in 

 Nitrating Acid.— J. C. Irvine and J. S. Dick: The Constitution of 

 Maltose. A New Example of Degradation in the Sugar Group. — R. J. 

 Manning and M. Nierenstein : The Tannin of the Canadian Hemlock 

 {Tsuga Canadensis, Ca.xr). 



FRIDAY, May 16. . 

 JROyal Institution, at 5.30.— Dr. S. F. Harmer : Sub-Antarctic Whales 

 and Whaling. 



NO. 2585, VOL. 103] 



MONDAY, May 19. . '" " 



Royal Geogkaphical Society, at 5.— Capt. W. B. R. King : The Us 

 of Geology in War. 



Institute of Metals, at 8. — Nint6 Annual May Lecture — Prof. 1 



Soddy : Radio-activity. 



TUESDAY, May 20. 

 Royal Institution, at j.— Prof. A. Keith : Britisli Ethnology— The Peopl 



of Ireland. 

 British A.ssociation Geophysical Di.scussio.ss (Royal Astronomic 



Society, Burlington House), at 5.— Col. H. G. Lyons will open a di' 



cussion on The Functions of a Geodetic Institute. Followed by Sir . 



Larmor, Sir C. F. Close, Mr. A. R. Hinks, and others. 

 Institution of Petroleum Technologists, at 5.30. — Dr. F. MoUv 



Perkln and T. C. Palmer : The Chemist and Engineer in Relation to tl 



Petroleum Industry. 



WEDNESDAY, Uh\ 21. 

 Royal Society of Arts, at 4.30. — Sir Francis T. Piggott : The Principl* 



o ^Japanese Design. 

 Royal Meteorological Society, at 5.— Capt. C. J. P. Cave and J. 



Dines : Further Measurements on the Rate of Ascent of Pilot Balloons 



J. E. Clark and H. B. Adames : Report on the Phenological Observation 



for 1918. 

 Geological, Society, at 5.30. 



THURSDAY, May 22. 



Royal Institution, at 3.— Prof F. Keeble: Intensive Cultivation. 



Royal Society, at 4.30. — Probable Papers : Prof W. J. Sollas : Th 

 Structure of Lysorophus as Exposed by Serial Sections. — O. Rosenhein 

 A Preliminary Study of the Energy Expenditure and Food Requirement 

 of Women Workers. — M. Greenwood, C. Hodson, and A. E. Tebb : Repoi 

 on the Metabolism of Female Munition Workers. 



Institution of Electrical Engineers, at 6. — Dr. S. Chapman : Electrii 

 Phenomena occurring in High Atmospheric Levels. 



SATURDAY, May 24. 

 LiNNRAN Society, at 3. — Anniversary Meeting. 



CONTENTS. PAGi 



Dynamics of Evolution. ByJ. A. T 201 



Experiments in Biological Method. By L. D. . . . 



Industrial Electrolysis. By J. B. C. K 



Our Bookshelf 



Letters to the Editor :— 



" Camouflage" of Ships in War.— Prof. J. Graham 

 Kerr, F.R.S .' 



A Possible Ca.se of Partial Sterilisation in Soil.— 



F. Knowles 205 



Mineral Production in Relation to the Peace 



Treaty. By Prof. H. Louis 205 



Theory of Bowed Instruments. (Illustrated.) . . . 207 



Statistics of Synthetic Dyes 207 



Notes 20$ 



Our Astronomical Column : — 



Coming Conjunctions 212 



Mars 212 



Aviation and Weather 212 



Fuel Economy. [With Diagiuni.) aij 



The Efficiency of Inventions 213: 



Chemistry in the National Service. By Sir William 



J, Pope, K.B.E., F.R.S 214. 



University and Educational Intelligence 217 



Societies and Academies 219 



Books Received 219 



Diary of Societies 22a 



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Advertisements and business letters to be addressed to tht 

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Editorial Communications to the Editor. 

 Telegraphic Address : Phusis, London. 

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