100 



NATURE 



[March 29, 191; 



M. p. Akimov : Rhinolophus bocharicus, n.sp. — M. D. 

 Zaiesskij : A marine sapropelite of the Silurian period 

 formed by a cyanophycean alga. 



December 3. — A. A. BSlopolskij : Researches on the 

 spectrum of 8 Cassiopeiae. — A. M. Liapunov : A formula 

 of analysis.— P. Krylov and E. Steinberg : Contributions 

 to the flora of the Kansk district, province of Jenissei. 

 — E. Eremlna : Genesis of fluorspar in Russia. — M. A. 

 Rakuzin : Absorption in petroliferous strata. — H. 

 Baklund : Fall of a meteorite at Boguslavka, neigh- 

 bourhood of Vladivostok.— N. V. Nasonov : The Tur- 

 bellaria fauna of Finland.— V. 1. Bianchi : (i) The birds 

 of the Government of Tver. (2) Our present know- 

 ledge of the avifauna of the Government of Olonetz. 

 (3) Geographical distribution of birds in North-West 

 Russia-in-Europe. (4) Synoptic table for determining 

 the Chiroptera of Russia-in-Europe. (5) The nidifica- 

 tion of the birds of the Government of Petrograd. 

 (6) Preliminary notes on Russian Chiroptera. — G. B. 

 Florovskij : The mechanism of reflex salivary secretion. 

 — N. S. Kurnakov and S. F. Zemcfuznij : The magnesium 

 salt lakes of the Perekop group. 



Historico-Philological Section. November 29. — 

 S. F. Oldenburg : Short description of a small collection 

 of Khotan antiquities belonging to D. V. Kossikovskij. 



December 7. — V. M. lonov : The study of the pre- 

 Christian faith of the Yakuts.— K. A. Inostrancev : A 

 few remarks on the religion of the ancient Turks. — 

 A. A. Sachmatov • Note on the language of the ancient 

 Bulgars. — F. I. Sierbatskoj : The doctrine of the cate- 

 gorical imperative among the Brahmans. — ^A. D. 

 Hudnev : Cha-Osir. Translation of a fragment of a 

 Buriat epic. 



BOOKS RECEIVED. 



The Idea of God in the Light of Recent Philosophy. 

 By Prof. A. Seth Pringle-Pattison. Pp. xvi + 423. 

 {Oxford : At the Clarendon Press.) 12s. 6d. net. 



The Combination of Observations. By D. Brunt. 

 Pp. X+219. (Cambridge: At the University Press.) 

 Ss. net. 



The Psychology of Sound. By Dr. H. J. Watt. 

 Pp. vii-(-24i. (Cambridge: At the University Press.) 

 10s. 6d. net. 



Domestic Economy : a Text -book for Teachers and 

 Students in Training. New edition. Part i., Theory. 

 By M. G. Bidder. Pp. vi + 167. Part ii., The Practice 

 and Teaching of Dornestic Economy. Bv F. Baddeley. 

 Pp. vi+189. (Cambridge: At the University Press.) 

 2S. 6d. net each. 



The British Journal Photographic Almanac and 

 Photographer's Daily Companion, 1917. Pp. 779. 

 {London : H. Greenwood and Co., Ltd.) ^s. net. 



British Museum (Natural History). Report on 

 Cetacea Stranded on the British Coasts during 19 16. 

 By Dr. S. F. Harmer. (London : British Museum 

 {Natural History); Longmans and Co., and others.) 

 IS. 6d. 



Year-book o' the Royal Society of Ix>ndon, 1917. 

 Pp. 235. (London : Harrison and Sons.) 5s. 



The Order of Nature. By L. J. Henderson. Pp. v-t- 

 234. (Cambridge, Mass.: Harvard Universitv • Press ; 

 London : H. Milford, Oxford University Press.) 6s. 6d. 

 net. 



The Banket : a Study of the Auriferous Con- 

 glomerates of the Witwatersrand and the Associated 

 Rocks. By Prof. R. B. Young. Pp. xv-l-i25-f 

 plates ^xviii. (London : Gurney and Jackson.) 8s. 6d. 

 net. 



The Calculation and Measurement of Inductance 

 ■and Capacity. By W. H. Nottage. Pp. 137. 

 (London : The Wireless Press, Ltd.) 2s. 6d. 

 NO. 2474, VOL. 99I 



DIARY OF SOCIETIES. 



THURSDA Vy March xq. 



RovAL Society, at 4.30. — The Fourth Colourless Sensation in the 

 Spectrum Sensation Curve when Measured in the Centre of the Retina : 

 Sir William Abney.— Magnetic Inertia: O. W. Walker.— The Selective 

 Properties of the Copper-ferrocyanide Membrane : F. Tinker. — X-Ray 

 Analysis of the Crystal-structure of Kutile and Cassiterite: C. M. 

 Williams. — Discontinuous Fluid Motion : Dr. J. G. Leathern. 



Royal Institution, at 3. — Telephony : Prof. J. A. Fleming. 



AERONAUTICAL Instituth, at 8. — The Necessity for New and Special 

 Treatment of Met.-ils Employed in Aircraft Construction : J. de Kozlowski. 



Institution of Naval .Architkcts, at ii a.m. — Further E.Kperiments 

 upon Wake and Thrust Deduction Problems : W.J. Luke.— Some Experi- 

 ments on the Influence of Running Balance of Propellers on the Vibration 

 of Ships: J. J. King-Salter. — Theory of Wave Motion on Water : Sir 

 George Greenhill. At 3 p.m. — Marine .'Application of Reduction Gears of 

 Floating Fram« TypeT J. H. Maca'pine. — Launching: P. A. Hillhouse 

 and W. H. Riddlesworth. — Buoyancy and Stability of .Submarines : Prof. 

 W. Hovgaard. 



LiNNEAN Society, at 5. — Prof. T. H. Morgan's Work on the Mechanism 

 of Heredity : W. Bateson. 



FRIDAY, March 30. 

 Royal In.stitution, at 5.30. — Recent Developments of Molecular Physics : 



Prof. J. H. Jeans. 

 Geologists' Association, at 7.^0. — Cephalopoda, and their Value in 

 Geological Study : W. F. Gwinnell. 



SATURDAY, March 31. 

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



MONDAY, April 2. 



Royal Geographical Society, at 5.30. — Two Journeys in the High 

 Atlas : Capt. A. J. A. Douglas. 



Aristotelian Soc:iety, at 8. — Is There any Justification for the Concep- 

 tion of Ultimate Value? W. A. Pickard-Cambridge. 



TUESDAY, April 3. 

 RoNTGEN Society, at 8.15. 



Zoological Society, at 5.30. — Big-Game Shooting in India: A. Ezra — 

 Notes on .some of the Viscera of an Okapi, Okapia johnstoni : R. H. 

 Burne. 



WEDNESDAY, April 4. 

 Entomological Society, at 8. • 



CONTENTS. PAGE 



Fish Migration 81 



The Partitions of Numbers 82 



Our Bookshelf ... 82 



Letters to the Editor: — 



Muscular Inefficiency and Possible Speeds of Walking. 



(;^/V// Z>/a^ra///.f.)— A. Mallock, F.R.S 83 



Gravitation and Thermodynamics. — Dr. P. E. Shaw 84 

 Talbot's Observations on Fused Nitre. — Prof. Alan 



W. C. Menzies 85 



Position and Prospects of Professional Chemists . 85 



The Weathering of Coal 87 



Rev. O. Pickard-Cambridge, F.R.S 88 



Notes 88 



Our Astronomical Column :— 



The Spectrum of N.G.C. 7023 . 92 



Imperial Astronomical Society of Russia 93 



Monthly Star Maps for 191 7 . 93 



Science Lectures to the Troops in France .... 93 



Nanna's Cave, Isle of Caldey 93 



Potash Fertilisers from Felspars 94 



The Natural Sciences in Public Schools 94 



University and Educational Intelligence 95 



Societies and Academies 96 



Books Received 100 



Diary of Societies 100 



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Advertisements and business letters to be addressed to the 

 Publishers, 



Editorial Communications to the Editor. 

 Telegraphic Address: Phusis, London. 

 Telephone Number : Gerhard 8830. 



