428 



NATURE 



[December 25, igig 



and the base of " C." The throw of the fault was 

 estimated to be at least 780 ft. Two other faults are 

 pointed out. One, in the middle of the exposure, 

 causes a repetition of "Z" beds, and has a down- 

 throw of 330 ft. to the south. The other, to the north 

 of this, throws in the opposite direction, and is 

 probably slight.* Three new species of corals are 

 described of the genera Michelinia, Zaphrentis, and 

 Endophyllum. — J. J. Dowling : An apparatus for the 

 production of high electrostatic potentials. The 

 apparatus is an influence machine which transforms 

 a battery voltage of, say, four hundred to, say, five 

 hundred volts. The ratio of transformation can be 

 adjusted, and the high potentials are remarkably 

 steady. .An earthed disc is carried to and fro, being 

 fixed to the end of a rod which is given a reciprocating 

 motion by an eccentric device. A contact-maker is 

 mounted on the eccentric shaft, and this alternatelv 

 connects a fixed insulated disc, mounted opposite the 

 earthed disc, alternately to the batterv and to the 

 apparatus which is to be maintained at the high 

 potential. One pole of the battery is, of course, 

 earthed. 



BOOKS RECEIVED. 



\ Short History of Education. By Prof. J. W. 

 -Adamson. Pp. xi-F37i. (Cambridge:' At the Uni- 

 versity Press.) I2S. 6d. net. 



Malleable Cast-iron. By S. J. Parsons. Second 

 •edition. Pp. xi+175. (London: Constable and Co., 

 Ltd.) 14s. net. 



Les Grottes de Grimaldi (Baoussc^-Roussi-). Bv 

 Prof. M. Boule. Tome i., Fasc. iv. : Geologic et 

 Pal^ontologie (Fin). Pp. 237-362+ plates. (Monaco.) 



-An Introduction to Social Psychology. By Dr. 

 W. McDougall. New edition. Po. xxiv + 459. 

 (London : Methucn and Co., Ltd.) ys'. 6d. net. 



Nationality and Race : From an -Anthropologist's 

 Point of View. By Prof. A. Keith. Pp.39. (London: 

 Oxford L'niversity Press.) 2X. net. 



Mesures Pratiques en Radioactivite. Bv Drs. W. 

 Makower and H. Geiger. Traduit de I'.Anglais par 

 ^ Philippi. Pp. vii-)-i8i. {Paris: Gauthier-Villars 



By Dr. J. M. 



Macmillan and 



et Cie.) 8 francs. 



Aircraft in Peace and the Law. 

 Spaight. Pp. viii + 233. (London 

 Co., Ltd.) Ss. 6d. net. 



.\rt Introduction to Anthrooologv. By Rev. E. O. 

 James. Pp. ix-H259. (London : Macmillan and Co., 

 Ltd.) ys. 6d. net. 



Psychology of the Normal and Subnormal. Bv Dr. 

 H. H. Goddard. Pp. xxiv+:;4g. (London : Kcgan 

 Paul and Co., Ltd.) 25.S. net. 



Lectures on Industrial Psvchologv. Bv B. Muscio. 

 New edition. Pp. iv-i-300. ' (London: G. Routledge 

 and Sons, Ltd.) 6.S. 6d. net. 



Fuel, Water, and Gas Analysis for Steam Users. 

 By J. B. C. Kershaw. New edition. Pp. xil-)-2oi. 

 (London : Constable and Co., Ltd.) 12.S. 6d. net. 



The .Aviation Pocket-Book for 1919-20. By R. B. 

 Matthews. Pp. xxiv+s36. (London: Crosby Lock- 

 wood and Son.) I2,s-. 6d. net. 



Outlines of the History of Botany. By Prof. R. I. 

 Harvey-Gibson. Pp. x + 274. (London': A. and C. 

 Black, Ltd.) lox. net. 



The Preparation of Organic Compounds. Bv E. De 

 Barry Barnett. New edition. Pp.xv + 273. (London: 

 J. and .\. Churchill.) To.f. 6d. net. 



-A Treatise on Qualitative .Analysis. By Prof. F. 



Clowes and J. B. Coleman. New edition. Pp. xvi-t- 

 400. (London : J. and A. Churchill.) 12s. 6d. 



Elementary Practical Chemistry. Bv Prof. F. 

 Clowes and j. B. Coleman. New edition. Part i. : 

 General Chemistry. Pp. xyi-i-241. (London: J. and 

 A. Churchill.) 6s. 



Modern Spiritism : Its Science and Religion. Bv 

 Dr. .\. T. Schofield. Pp. ix-l-259. (London : J. and A. 

 Churchill.) 3s. 6d. net. 



Die Stamme der W'irbeltiere. Bv Prof. O. AbeL 

 Pp. xyiii + gi4. (Berlin and Lei[)zig : \V. de Gruvter 



DIARY OF SOCIETIES. 



MONDAY, nixEMiiRR 29. 

 RovAi. Geographical SociBTv(at .^~o'ian Hati), at 3.^0. — Mrs. Dickinson 

 Berry: Serbia and Yuso-Slavia, liefore the War and After (Christmas 

 Lecture to Young People). 



TUESDAY. Dkcemcek 30. 



RovAL Institution of Great Britain', ar 7.— Prof. W. H. Bragg : 



The World of Sound, I., What is Sound'.' (Chrislmas Lectures). 



THURSDAY. January i. 



RovAi- Institution of Great Britain, at 3. — Prof. W. H. Bragg: 



The World of Sound, II., .Sound and Music (Christmas Lectures). 



FRIDA Y. January 2. 



RovAl. Geog^aphicai. Society (at ^olian Hal!), at 3.30.— Miss Hilds 

 Bowser : A Visit to the Diamond Mountain in Korea (Christmas Lecture 

 to Young People). 



Royal SocIET^■ ok Art- (Indian Section), at 4.30. — A. P. Morris : 

 Bin-mese Village Industries : Their Present State and Possible De- 

 velopment. 



SATURDAY, January 3. 



Royal Institution of Great Britain, at 3. — Prof. W. H. Bragg 



The World of .Sound, III., :50unds of the Country (Christmas Lectures). 



CONTENTS. PAGE 



The Profession of Chemistry 409 



Flowering Plants and Ferns 410 



Our Bookshelf 411 



Letters to the Editor: — 



Polarisation of Light Scattered by Helium Atoms. — 



Right Hon. Lord Rayleigh, F.R.S 412 



Gravitation and Light. — Sir Joseph Larmor, M.P., 



F.R.S 412 



Radioactivity and Gravitation. — SirE. Rutherford, 



F.R.S., and Dr. A. H. Compton 412 



Mortality among Snails and the Appearance of Blue- 

 bottle Flies. — Dr. N. Annandale 412 



Remains of a Fossil Lion in Ipswich. — Nina F. 



Layard 413 



Promotion of a Plumage Bill. — H.J. Massingham. 413 

 The Deflection of Light during a Solar Eclipse. — 



Capt. C. J. P. Cave 413 



Industrial Resources of India . . . ■ 413 



The Reform of the Calendar. By H. C. P 415 



Notes 416 



Our Astronomical Column : — 



Barnard's Proper-Motion Star 420 



The Great Solar Prominence of Last May 420 



Atomic Disintegration and Heat Energy 420 



The British Association at Bournemouth : — 



Section M — Agriculture — Opening Address (Abridged) 

 by Prof. W. Somerville, D.Sc, President of 



the Section 421 



University and Educational Intelligence 425 



Societies and Academies 426 



Books Received 428 



Diary of Societies 428 



NO. 2617, VOL. 104] 



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