:i h i 



NATURE 



[February 20, 1919 



Min 1 . and Lenses : A T< st-bool oi Gi 



B3 Prof. J. P. ( '. Southall. (Ni 



York: I In- Macmillan Co.; Lond Macmillan and 



Ltd., 1918.) j.25 dollai s. 

 Recenl \dvances in Physical and [norganii Chemi 

 B 1 'i \. W. Stewart. With an introduction by 

 sir Willi. mi Ramsay. Third edition. Pp. \\ 



( London : Longman , n, md Co., 1919.) 



net. 



Recenl Discoveries in [norganii Chemistry. Bv 

 J. II. n t-Smith. Pp. .. 1 1,1 (I i'n 1 



Press, nii'i.) .)•. 6d. net. 

 The Great Wai Brings il Home, The Natural Ri 

 construction of an Unnatural Existence. By John 

 [rave ("White Fox"). Pp. xvi+367. (London: 

 ( Nonstable and Co.; I .td., 1919.) 10s. 6d. net. 



The Voice Beautiful in Speech and Song: A Con- 

 sideration of the Capabilities of the Vocal Cords ami 

 Work in the \i 1 "I Tone Production. By 

 Ernesl G. White. New and enlarged edition ol 

 "Science and Singing." Pp. viii + 130. (London: 

 J. \l. I). in and Sons, Ltd., 1918.) 5s, net, 



I In 1 ultiv; 1 ni Osiers and Willows. H\ W. P. 



Ellmore. Edited, with introduction, bv Thomas Okev. 

 Pp. x + 96. (London: J. M. Dent and Sons Ltd., 



'i 4*- 



rhi liiiiHN of Modern Optical Instruments. \ 

 Reference Honk for Physicists, Manufacturers ot 

 Optical Instruments, and for Officers in the Army and 

 Navy. Translated from the German by Dr. A. 

 Gleichen, II. II. Emsley, and W. Swaine. With an 

 Vppendix on Rangefinders. Po. XU4-376. (Lm 

 H.M.S.O., roi8.) 



Milcrogi iphii des Holzes der auf Java Vorkom- 

 menden Baumarten, im Auftra^e des Kolonial- 

 Minisi.-i iunis. Unter leitune von Prof. J. W. Moll. 

 Bearbeitel von Dr. H. H. Janssonius. Fiini 

 Lieferung. Pp. 337 704. (Leiden: E. J. Brill, 1918 I 



DIARY OF SOCIETIES. 



THURSDAY, 1 

 at 3.— Prof. H. M. Lefroy : 



Roval Institutio 

 Food Supplies. 



Roval Societv, at 4.30. — Jean Dufrenoy 

 of the Glucosi lei of the irhutin Groin 

 Welts: Denial Chances in the Teeth of th 

 Scorbutic Diel M 1 and W. Ci 



Mechanism of Bacterial Infection. Ma 

 1 of the Serological Types "I r». tetan 



of < 



Prophyla 

 and In 



)n the Metabolistr 



Zilva and E. M. 



le Guinea-pig produced by r 



ramer : A New Factor in tin 



W. J. Tullorh: The Distribi 



Wounds of M 



nd a Study of the Mechanism of Infectii 

 s b M 1 



3V, at 5.— S I. Truscott : Slim. 

 Treatment on Cornish Frames: Supplements.— Edwin Edser : The Com- 

 parison of Concentration Results, with Special Reference to 



( Concentrating Ca«siterite.— C. W Gurleeon : The Giblin Tin 

 Lode of Tasmania.— G. F. I. Preumonl : Wolfram Minine in Bolivia. 

 I.1NNF.AN Societv, at s;.-C. E. Salmon : Drawings of British Orchids and 

 Sea Anemon.-s, by Mr. T. A. Stephenson.— R. H. P.urne : Specimens ol 

 1 | ins in Invertebrates and Fishes. 

 Institution op Electrical Engineers, at 6.— G. L. Addenbrooke : 

 Dielectrics in Electric Fields. 



CIETY, at 8.— R'. C. Farcher and F. L. Pvman : Nitro-. 

 \i,i,iio-clvovalines.-J. Knox and M. B. Ricl 



\y id- and Pin' 

 .. en W 1 Note on the Action of Chlorine 



on Tetramethyl Ammonium Iodide. 



FRIDAY, February 2i. 

 11 3.— Annual General Meeting. 

 Roval Insti ,1 5. to. — A. T. Hare : Clock Escapements. 



Institution hi Mi ., ai. Engineers, at n — Annual General Meetinc;. 



I T. Heaton : El. H. Cave: 



The Devetopn etylene Welding and Cutting Industry i 



tbeUnitea tati <i ■ , . . . , Welding.— F. Hazledine : 



Oxy-acetylenc W, 



SATURDAY, February 22. 

 Roval Institution, at 3.— Hoi I. W. Fortescue: The Empires Share 1 



England's \Y. 11 a, . 



MONDAY. Fl ,i , 4. 



Rovai So. 11 tv 1,1 Arts, al 4. . Prof. J. A. Fleming: Scientific Prob- 

 lems of Electric Wave Telegraphy. 

 Roval Geographical Societv, at 3. I t.-l I. H. S. L. Winterbotham : 



1 li\ with the British Armies in ! 1 



TUESDAY, 1 1 

 Roval Institution 11 Capi I on: The Dynami 



.— E. J. Duveen : Key Industries and 

 Impi rial Resoui 



Institution of Civil 1 1 : The Flow of 



I in Pipes and I 1 



Relal 



1 unnington : Som> 

 on Railv 1 



WEDNESDAY. February 26. 



Roval Societv op Arts, at 4.30.— W. L. Hichen 



in Indn 



11 5.30.— Lieut. E, H. Pascoe : The Early 11 

 of the Imliis. Brahmaputra, and 1. 

 Rovai ^l rv, at 8.— Capi. F. S. Barnwell : Some 



Points on Aeroplane Design. 



THURSDAY, February 17. 



Rovai. Institution, at 3.— Prof. H. M. Lefroy: How Silk is Grown and 

 Made. 



Rovai s , 'FrobabU Papers •' Hon. R. J. Stn 



of Light by Sola! Substances. — Sir fame ! 



The ( on titution ot Sulphui Vapour.- Dr. W. G H Burn- 



ham, and A. 11. Davis : The Pressure upon the I tiled 



I mi d at 6.— Dr. P. B. Ballan I Indi 



vidual Child. 

 [nstituti i 1 1 1 . 1 1 1 1 : at 6 Di 1 Barclay and 



Dr. S. P. Smith : The Determination of the Efficiency of the I urbo- 



alternator. 



FRIDAY, February 28. 

 Phvsicai Society, at 5.— Philip R. Coursey: Simplified 1 



Calculations, with Special Reference 10 Tim It Co 1 



i ts in Connection with Whistles 



and Flules. — G. A. Brodsky : Demonstration of a New Polariser. 

 Roval Institution, al 5.30. — Sir Oliver Lodge : Ether and Matter. 



SATURDAY. Mu 11 1. 

 Royal Institution, at 3. — Hon. J. W. Fortescue : The Empire 

 England's Wars— Eastern Europe. 



CONTENTS. page 



Education in the Army 481 



Ancient Palestinian Folk-lore. By R. C. T. . . 483 

 The Past and Future of Organic Chemistry. By 



J. B. C 484 



Our Bookshelf 4 S 5 



Letters to the Editor: — 



The Supposed "Fascination" of Birds by Snakes 

 ami the "Mobbing" of Snakes by Birds.— Prof. 



Edward B. Poulton, F.R.S. . 4S6 



The Shortage of Research Workers. — Chas. R. 



Darling 4°^> 



The Indian Rope Trick.— Lt. -Col. G. Huddleston 4S7 



The Use of Helium for Aircraft Purposes 487 



Birds and the War. Bv Capt. Hugh S. Gladstone. 488 



Prof. G. Carey Foster, F.R.S 4S9 



Notes . 49° 



Our Astronomical Column : — 



Luminosities and Distances of Cepheid Variables . . 494 



il Velocities of 119 Stars 494 



"Anuario del Observatorio de Madrid" 494 



The Chemistry of Seaweeds. By Prof. James 



Hendrick 494 



Italian Climatology 495 



University and Educational Intelligence . ... 496 



Societies and Academies 497 



Books Received 499 



Diary of Societies S 00 



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2573, VOL. I02] 



Editorial Communications to the Editor 

 Telegraphic Address : Phusis, London. 

 Telephone Number : Gerrard 8830. 



