196 



NATURE 



[April 27, 1916 



U.S. Geological Sur- 



the United States. 



, Nos. 3-13. Part ii., 



Government Printing 



Report on the Non-Calcareous Sponges collected by 

 Mr. James Hornell at Okhamandal in Kattiawar in 

 1905-6 (with four plates). By Prof. A. Dendy. (Lon- 

 don : Williams and Norgate.) 45. net. 



Mysore Government Meteorological Department. 

 Report on Rainfall Registration in Mysore for 1914. 

 By. N. Venkatesa Iyengar. Pp. xvii + 49 + plates iii. 

 (Bangalore : The Government Press.) 



The Principles of Plant Culture. By the late E. S. 

 Goff. Revised by J. G. Moore and L. R. Jones. 

 Eighth edition. Pp. xxiii + 295. (New York: The 

 Macmillan Company; London: Macmillan and Co., 

 Ltd.) 5s. 6d. net.' 



Department of the Interior, 

 vey. Mineral Resources of 

 Calendar Year, 1914. Part i., 

 Nos. 8-30. (Washington : 

 Office.) 



Smithsonian Miscellaneous Collections. Vol. Ixv., 

 Nos. II, 12, 13. (Washington : Smithsonian Institu- 

 tion.) 



Department of Commerce. Technologic Papers of 

 the Bureau of Standards. Nos. 59, 62, 63, 68. 

 Scientific Papers of the Bureau of Standards. Nos. 260, 

 261, 264, 265. (Wasliington : Government Printing 

 Office.) 



Department of the Interior. U.S. Geological Sur- 

 vey. 27 Bulletins. Water Supply Papers. 13 Papers. 

 (Washington : Government Printing Office.) 



Field and Laboratorv Studies of Soils. By Prof. 

 A. G. McCall. Pp. viii + 77. (New York: J. Wiley 

 and Sons, Inc. ; London : Chapman and Hall, Ltd.) 

 25. dd. net. 



Report of the Secretary of the Smithsonian Institu- 

 tion for the Year ending June 30. Pp. iii +110. 

 (Washington : Government Printing Office.) 



Report of the Commissioner of Education for the 

 Year ended June 30, 1914. Vol. i. Pp. xxxviii + 8io. 

 Vol. ii. Pp. XXV + 565. (Washington: Government 

 Printing Office.) 



Smithsonian Institution. Bureau of American 

 Ethnology. Bulletin 57. An Introduction to the 

 Study of the Maya Hieroglyphs. By S. G. Morley. 

 Pp. xvi + 284. (Washington: Government Printing 

 Office.) 



Smithsonian Institution. U.S. National Museum. 

 Bulletin 92. BibHoj?raphic Index of American Ordo- 

 vician and Silurian Fossils. By R. S. Bassler. Vol. i. 

 Pp. viii + 718. Vol. ii. Pp. iv 4- 719-152 1. (Washing- 

 ton : Government Printing Office.) 



Leland Stanford Junior University Publications. 

 University Series. The Pronoun of Address in Eng- 

 lish Literature of the Thirteenth Century. By A. G. 

 Kennedy. Pp. 91. The Anoplura and Mallophaga of 

 North American Mammals. By Prof. V. L. Kellogg 

 and G. F. Ferris. Pp. 744-plates viii. (California: 

 Stanford University.) 



DIARY OF SOCIETIES. 



THURSDAY, April 27. 



Royal Society of Arts, at 4.30. — Scientific Agriculture in India: J. 

 MacKenna. 



Mathematical Society, at 5-30. — The Green's Function for the 

 Equation v«2+>t2«=o (II): H. S. Carslaw. — On the Uniformity of 

 Gaseou"! Density, according to the Kinetic Theory : S. Chapman. — The 

 Nodal Points of a Plane Sextic : J. Hodpkinson. — Some Problems of 

 Comhinatory Analysis : P. A. Macmahnn — On the Deduction of Criteria 

 for the Convereence of Fouri-r's Series from Fejer's Theorem concerning 

 their Summability : S. Pollard. — On the Derivates of a Function: 

 Mrs. G. C. Young. — Note on Functions of Upp^r and Lower Type : 

 W. H Young. 



FRIDAY, April 28. 



Geological Physics Society, at 5. — Presidential Address: Growths in 

 Silica Gel : Prof. Beniamin Moore 



MONDAY, May i. 

 Aristotelian Society, at 8. — The Limitation of Pure Reason : Prof. 

 G. Dawes Hicks. 



Society of Chemical Industry, at 8. 



Medical Society, at 8 30.— Shakespeare and Medicine: Sir St. Clair 

 Thomson. 



TUESDAY, May 2. 

 RovAL Institution, at 3.— Indian and Persian Painting: L. Binyon. 



WEDNESDAY, May 3. 



Society of Public .Analysts, at 8. — Salvarsan rnd Neo-Salvarsan, 

 Excretion and Secretion of: W. H. Willcox and J. Webster. — Micro- 

 scopical Methods : H. G. Greenish. 



Ento.mologial Society, at 8. 



THURSDAY, May 4. 



Royal Institution, at 3.— Flints and Flint Implements: Sir Ray 

 Lankester. 



Iron and Steel Institute, at 10.30. — Presidential Address. Papers: 

 Notes on the Theory of the Corrosion of Steel : I,. Aitchison. — Notes on 

 the Relations between the Cutting Efficiencies of Tool Steels and their 

 Brinell or Sclero>cope Hardnesses : Prof J. O. Arnold. — A New Thermo- 

 Electric Method of Studying All' tropic Changes in Iron or other Me'als : 

 Dr. C. Benedicks. — Initial Temperature and Critical Cooling Velocities of 

 a Chromium Steel : Dr. C. A. Edwards.— The Influence of Carton and 

 Manganese upon the Corrosion of Iron and Steel : Sir Robert Hadfield 

 and Dr. J. N. Friend. — Early Experiments on the Kecalescence of Iron 

 and Steel : A. Mallock. — A Few Experiments on the Hardness Testing of 

 Mild Steel : W. N. Thomas. — Surface Tension Effects in the Inter- 

 crystalline Cement in Metals and the Elastic Limit : V. C. Thompson. 



Linnean Society, at 5. — The Origin of the Garden Red Currant : E. A. 

 Bunyard. — The Dispersal of Organisms, as Llustra'ed by the Floras of 

 Ceylon and New Zealand : Dr. J. C. Willis. — A Study of the Rectal 

 Breathing Apparatus in the Larvae of the Anisopterid Dragonflies : R. J. 

 Tillyard. — Description of a New Species of Idotea (Isopoda) from the 

 Sea of Marmora : W. E. Collinge. 



FRIDAY, May 5. 

 RcYAL Institution, at 5.30. — Electrical Methods in Surgical Advance: 



Sir J. Mackenzie David.son. 

 Iron and Steel Lv,stitu 1 e, at 10. — (See above.) 

 Geologists' Associ.\tion, at 7.30. — Field Notes on the Faunal Succession 



in the Lower Carboniferous Rocks of Westmorland and North 



Lancashire : Prof E. J. Garwood. 



SATURDAY, May 6. 

 Royal Institution, at 3. — X-Rays and Crystals: Prof W. H. Bragg. 



CONTENTS. 



PAGE 



Ancient Hindu Science 



British Fresh-water Rhizopods. By E. H.-A. . . . 



Mathematical Text-books 



Our Bookshelf 



Letters to the Editor: — 



The West Indian Firefly.— Prof. William H. 

 Pickerins: 



"Optical Glass" and Fluorite : An Ethical Note. — 

 Prof. Marcus Hartog; F. J. Cheshire . . . 



The Remarkable Meteors of February 9, 191 3. — 



W. F. Denning 



Foreign War-planes. {Illustrated.') 



The Daylight Saving Scheme 



The Imperial Institute 



The Sun's Rotation 



Notes 



Our Astronomical Column :— 



The Planet Mercuiy 



Comet I9i6£z (Neujmin) . 



The Irregular Variable Star, T Tauri 



A New Variable Star Having Nebulous Envelope . . 

 The Indian Science Congress 



The Glacial Theory of Coral Reefs. By J. W. G. 



Illusions of the Upper Air. — A Review of Progress 



in Meteorological Theory in England since 1866. 



By Sir Napier Shaw, F.K.S 



University and Educational Intelligence 



Societies and Academies 



Books Received 



Diary of Societies 



•177 

 178 

 179 

 179 



180 

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182 



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lb. 



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Editorial and Publishing Offices : 



MACMILLAN & CO., Ltd., 



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



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Advertisements and business letters to be addressed to ih 

 Publishers. 



Editorial Communications to the Editor. 

 Telegraphic Address : Phusis, London. 

 Telephone Number : Gerrard 8830. 



NO. 2426, VOL. 97] 



