3i6 



NATURE 



[JUNE 8, I916 



described. — M. and Mme. F. Mpreau : The phenomena 

 of sexuality in lichens of the genus Solorina. — J. 

 Glover : An electrical apparatus for auscultation, 

 clinical exploration, and experimental physiology. — P. 

 Lecene and A. Frouin : Experimental researches on 

 the mechanism of encystment of foreign bodies and 

 on latent- microbism. — M. Marage : The classification 

 xDf deaf soldiers according to their power of hearing. 

 A criticism of the current methods for determining 

 deafness in the French Army. These are shown to 

 be faulty in three respects. 



BOOKS RECEIVED. 



Quartic Surfaces with Singular Points. By Prof. 

 C. M. Jessop. Pp. XXXV+ 197. (Cambridge : At the 

 University Press.) 125. net. 



British Birds. Written and illustrated by A. Thor- 

 burn. Vol. iii. Pp. vi + 87 + plates. (London: Long- 

 mans, Green and Co.) 1/. 115. 6d. net. 



Hart's Note-Book for Navigators and Others. 

 (Colchester: Benham and Co., Ltd.) 



Memoirs of the Geological Survey. Special Reports 

 on the Mineral Resources of Great Britain. Vol. v.. 

 Potash, Felspar, Phosphate of Lime, Alum Shales, 

 Plumbago or Graphite, Molybdenite, Chromite, Talc 

 and Steatite (Soapstone, Soap-rock, and Potstone), 

 Diatomite. Bv Dr. A. Strahan and others. Pp. iv + 

 41. (London :" H.M.S.O. ; E. Stanford, Ltd.) is. 



Men of the Old Stone Age : their Environment, Life, 

 and Art. By Prof. H. F. Osborn. Pp. xxvi + 545. 

 (London : G. Bell and Sons, Ltd.) 215. net. 



Central American and West Indian Archaeology. 

 By T. A. Joyce. Pp. xvi4-27o. (London : Philip Lee 

 Warner.) 125. 6d. net. 



The Breath of Life. By J. Burroughs. Pp. x + 295. 

 (Boston and New York : Houghton Mififlin Co. ; Lon- 

 don : Constable and Co., Ltd.) 5s. net. 



The Psychology of Relaxation. By Dr. G. T. W. 

 Patrick. Pp. viii + 280. (Boston and New York: 

 Houghton Mifflin Co.; London: Constable and Co., 

 Ltd.) 55. net. 



The Athenaeum Subject Index to Periodicals, 1915. 

 Fine Arts and Archreology. Second edition. Pp. 33. 

 (London : The Athenaeum.) is. 6d. net. 



Department of Statistics, India. Agricultural 

 Statistics of India, 1913-14. Vol. i. Pp. x-t-415. 

 (Calcutta : Superintendent Government Printing.) 

 2.8 rupees. 



Costruzioni di Strade e Gallerie. By Prof. Ing. S. 

 Rotigliano. Pp. xxiii + 808. (Milano : U. HoepH.) 

 18 lire. 



The Life of Inland Waters. By Prof. J. G. Need- 

 ham and J. T. Lloyd. Pp. 438. (Ithaca, N.Y. : 

 Comstock Publishing Company.) 



A Manual of Practical Physics. By H. E. Hadley. 

 Pp. viii + 265. (London: Macmillan and Co., Ltd.) 



Synchronous Signalling in Navigation. By Prof. 

 J. Joly. Pp. 64. (London: T. Fisher Unwin, Ltd.) 

 3s. 6d. net. 



Wild Flowers of the North American Mountains. 

 By J. W. Henshaw. Pp. xv + 383. (London and 

 New York : McBride, Nast and Co., Ltd.) 105. 6d. 

 net. 



Forty-seventh Annual Report of the American 

 Museum of Natural History for the Year 1915. Pp- 

 194. (New York.) 



The Cicindelinae of North America as arranged by 

 Dr. W. Horn in Genera Insectorum. Edited by 

 E. D. Harris and C. W. Leng. Pp. vi + 23. (New 

 York : American Museum of Natural History.) 



NO. 2432, VOL. 97] 



DIARY OF SOCIETIES. 



THURSDA Y, June 8. 



RovAL SociETV, at 4.30. — Further Determinations of Direct Osmotic Pres- 

 sures : The Earl of Herkeley and E. G. J. Hartley. — The Magnetic 

 Shielding of Large Spaces, and its c xperimental Measurement : Prof. E. 

 Wilson and-Prol. J. \V. Nicholson. — Motion of Solids and Fluids when 

 the Fiow is not Irrotational ; G. I. Taylor. 



Royal Institution, at 3. — Chamber Music and its Revival in England: 

 Sir Alexander Mackenzie. 



Mathematical ^oCrETV. at 5.30.— The Clas.sification of the Integrals of a 

 Linear Partial Differential Equation of the First i )rder : Prof. M. J. M. 

 Hill. — (i) Non-absolutely Convergent, not necessarilv Continuous, Inte- 

 grals ; (?) The Convergence of Fourier Serie< and of their derived Series : 

 Prof W. H. Voung. — I'he General Linear pifiFcrential Equation : Dr. S. 

 Brodetsky. — A Note on the Seri s 'S.an sin nd and 2<in cos «S, where {uiC) 

 is a Sequence of Positive Numbers tending steadily to Zero : A. E. Jolliffe. 



Institution of Mining Enginef.ks, at 10.45 a.m. — The History of the 

 Safety-Lamp : Prof F. W. Hardwick.— Th- Health of Old Col iers : Dr. 

 J. S. Haldane. — The Estimation of Moisture in Coal : T. F. Winmill. — 

 (i) The Absorption of Oxygen by Coal. VIII. and IX. ; (2) The Oxidation 

 of Pyrites : T. F. Winmill. 



Optical Society, at S.^Modern Technical Applications of Radium and 

 other Luminous Substances : F. Harrison Glew. 



FRIDAY, June 9. 



Royal Institution, at 5.3o.^Eyesight and the War: Dr. E. Clarke. 



Royal Astronomical Society, at 5. — An Inequality in the Period of 

 the Eclipsing Variable RZ Cassiopeia; : R. S Dugan. — A Prjbable 

 Relation between the Changes in Solar Radiation and the Melting of the 

 Polar Snow Caps of Mars: E. M. Antoniadi. — Micrometrical Measures 

 of Double Stars : Rev. T. E. R. Phillips. 



Malacological Society, at 8.— Note on Erato guttula. Sow. : J. R. le B 

 Tomlin. — An Undescribed Ammonoid from the Lower Greensand (Aptian) 

 of Kent : G. C. Crick. — Helix scytodes : Prof. G. K. Gude. 



- SATURDAY, JutiK 10. 

 Royal Institution, at 3.^Folk-lore in the Old Testament : Sir J. G. 

 Frazer. 



CONTENTS. PAGE 



The Moving Picture and its Mechanism. By Prof. 



C. V. Boys, F.R.S 297 



Modern Analysis 298 



Docility and Other Diseases 299 



Our Bookshelf 300 



Letters to the Editor:— 



Molecular Attractions in Solutions.— The Earl of 



Berkeley, F.R.S 301 



Meteorological Conditions of a Blizzard. — L. C. W. 



Bonacina 301 



Sir Ernest Shackleton's Antarctic Expedition. 



{fVtl/i Map.) 301 



Return Currents and Electrolytic Corrosion . . . 303 



Science and Government 304 



Notes . 307 



Our Astronomical Column :— 



A Large Group of Sun-spots 311 



The Total Solar Eclipse of February 3, 1916 .... 311 



The Spectrum of Nova G«minorum No, 2 ..... 311 



Latitude Observations by Photography 311 



The Royal Observatory, Greenwich 311 



The Place of Science in Modern Metallurgical In- 

 dustries. By H. C. H. C 312 



Recent Entomology. By G. H. C 312 



University and Educational Intelligence 313 



Societies and Academies 314 



Books Received 316 



Diary of Societies 316 



Editorial and Publishing Offices : 



MACMILLAN & CO., Ltd., 



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



Advertisements and business letters to be addressed to the 

 Publishers. 



Editorial Communications to the Editor. 

 Telegraphic Address : Phusis, London. 

 Telephone Number : Gbrrard 8830. 



