8o 



NATURE 



[September 26, [918 



the transformation. A general disr 



cussioi ' tematic theory and interpretation oi 



v functions which contain the parameters 



1 11 transformations which leave invariant 



nary quadratic form, including the invarian - ol 



Proceedings, vol. iv., No. 6), fune, 1918. I. G, 

 Benedict and P. Roth: Effects of a prolonged reduction 

 in diet on twenty-five men. I. Influence en basal meta- 

 bolism and nitrogen excretion. — W. K. Miles: Effect of 

 a prolonged reduction in diet on twenty-five men. 

 II. Bearing <>n neuro-muscular processes and mental 

 condition. II. M. Smith: Effects of a prolonged re- 

 duction in diet on twenty-five men. III. Influeno 

 "ii efficiency during muscular work. — C. E. McClung : 

 Possible action of the sex-determining mechanism. — 

 E. Blackwelder : The study of the sediments as an aid 

 to the earth historian. <>. II. Parker ; The growth of 

 the Alaskan fui si al herd between 1912 and 1917. 

 Since nii2 the stead} increase in the number of pups 

 horn and of harem bulls, and the decrease since 1913 

 of the average harem, are most favourable signs in 

 the growth >>l the herd. The one unfavourable feature 

 during this period is the considerable increase in idle 

 hulls in IQ15, 1916, and especially in 1917. This 

 increase, which can he eventually checked, show*; that 

 commercial killing should have been restored 

 ears ago. \Y. N. Berg and R. A. Kelser : The 

 ruction of tetanus antitoxin by chemical agents. 

 The results indicate that tetanus antitoxin is ;, sub- 

 stance of non-protein nature, but the stability of the 

 antitoxin is so dependent upon that of the protein 

 to which it is attached that whenever the protein 

 molecule is split, the antitoxin splits with it.— G. P. 

 Merrill : Tests fur fluorine and tin in meteorites, with 

 notes on maskelynite and the effect of dry heat on 

 meteoric stones.— F. W. Clarke: Notes on isotopic 

 lead. Investigations on the atomic weight of various 

 Forms of lead, and radio-active estimates of the age of 

 minerals, are analysed for the purpose of throwing 

 light upon isotopes and the structure of chemical 

 elements. 



(Proceedings, vol. iv., No. 7), July, 1918. — G. H. 

 Hardy : The representation of a number as the 

 sum of any number of squares, and in par- 

 ticular of five or seven. — A. St. John: The crystal 

 structure of ice. Ice is properly assigned to 

 the hexagonal system, and consists of four 

 inter-penetrating triangular lattices, of which the 

 fundamental spacings have been obtained. — W. M. 

 Davis : Fringing reefs of the Philippine Islands. An 

 interpretation of recently published large-scale charts 

 of the United States Coast and Geodetic Survey. — 

 W. S. Halstead : Dilation of the great arteries distal 

 i.illv occluding hands. The relative amount of 

 11 required to give the most pronounced 

 result been determined, so that the author is 



able in almost every instance to produce the dilation, 

 and a larj amount of material thereby accumulated 

 is analysed. \. A. Michelson : The correction of 

 optical su ■ 



BOOKS RECEIVED. 



lb. Neo-Pla A Study in the History of 



Hellenism. Bj I r, Second edition, with 



a Supplement on iii.iiies of Proclus. 



Pp. xv + 318. (Can 'he University Press.) 



I2S. ml. 



Petroleum Ri lining. By V. ibell. Pp. xvi+ 



297. (London : C. Griffin and 1 . ltd.) 25s. net. 



Practical Surveying and 1 ield By V. G, 



Salmon. Pp.viii + 204. (Londo n and Co., 



-■.. iul . net. 



0. 2^5 2. VOL. I02] 



Practical I hemistrj foi [ntermediati I lasses. B) 

 Prof. II B. I limine lin. Pp. \ii 1 277. 1 London : 

 \ha mill. in and Co.', Ltd. 1 5s, 



Food Gardening For Beginners and Experts. By 

 II. Y. Davis. Second edition. Pp. viii+133. 

 (London: G. Bell and Sons, I. id.) is. net. 



Modern Engin g Measuring Tools. Bj E. Pull. 



Pp. viii+115. 1 London: Crosbj Lockwood and Son.) 

 45. 6d. tut. 



Rats and Mice as Enemies of Mankind. B5 

 M. A. ( '. llinton. Pp. x+63. (London: Trustees 

 of the British Museum.) is. 



Seaside Planting for Sin Iter, Ornament, and Profit. 

 By A. 1). Webster. Pp. 156. (London: T. Fishei 

 I'nu in, Ltd.) iSs. net. 



(oast Erosion and Protection. By Prof. E. R. 

 Matthews. Second edition. Pp. xvi+195+frontis- 

 \2 plates. (London: C. Griffin and Co., 



Ltd.) U.v. 6d. int. 



New Reduction Methods in Volumetric Analysis. 



By Prof. 1'".. Knecht and E. Hibbert. Re-issui with 

 additions. Pp. x+135. (London: Longmans and 



Co.) 5$. net. 



CONTENTS. page 



Applied Optics. By A. E. C 61 



The Megalithic Culture of Indonesia. By Prof. G. 



Elliot Smith, F.R.S. . 61 



War Work of the British Medical Services 62 



Our Bookshelf 63 



Letters to the Editor: — 



Substitutes for Platinum. — Dr. Ch.-Ed. Guillaume . 64 

 Future Treatment of German Scientific Men. — Lt.-Col. 



H. H. Godwin-Austen, F.R.S 64 



The South Georgia Whale Fishery. — Dr. Sidney F. 



Harmer, F.R.S. ... 65 



Vitality of Gorse-seed. — John Parkin 65 



Rock -disintegration by Salts.— C. Carus-Wilson . . 66 



German Industry and the War. 1 66 



Medical Education in England ... 67 



The Dynamics of Cyclonic Depressions. By J. S. D. 69 



Notes . . . 7° 



Our Astronomical Column : — 



Twenty-four-hour Time in the Army 74 



Wolfs Comet 74 



Borrelly's Comet 74 



The New Star in Aquila -74 



The Metallography of Tungsten Steels. ByH.C. H. C. 74 



Fuel Economy -75 



Salaries in Secondary and Technical Schools, etc. 



By J. Wilson 75 



High-Temperature Processes and Products. By 



C. R. Darling . 7° 



University and Educational Intelligence 78 



Societies and Academies 79 



Books Received 80 



(Index.) 



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