668 



NATURE 



[July 22, 1920 



Critical points and intensity ratios are discussed. — 

 J. B. Murphy : The effect of physical agents on the 

 resistance of mice to cancer. The evidence points to 

 the lymphoid tissue as an important agent in the 

 immunity reaction of transplanting cancer of mice. — 

 H. C. Sherman : The protein requirement of mainten- 

 ance in man. For the maintenance of healthy men and 

 women an intake of not more than 35-45 grams of 

 protein per " man " of 70 kg. per day is sufficient 

 even when the protein is not especially selected, and 

 hence the "standard" allowance of i gram of protein 

 per kg. of bodv-weight per day provides an ample 

 margin of safety.— R. P. Cowles : The transplanting 

 of sea-anemones by hermit crabs. A study of 

 behaviour with the jsroblems it presents in this par- 

 ticular case. — J. A. Anderson : Spectra of explosions. 

 Discussion of a new method for obtaining intense 

 spectra of short duration, the new source of light 

 being of the order of one hundred times the brilliancy 

 of the sun. — Report of the Autumn Meeting : The 

 report contains Items of business, including the award 

 of medals, the distribution of research grants, and 

 the list of papers read before the Academy. 



Books Received. 



Gold : Its Place in the Economy of Mankind. By 

 B. White. Pp. xi+130. (London: Sir I. Pitman and 

 Sons, Ltd.) 3s. net. 



British Museum (Natural History). Catalogue of 

 the Lepidoptera Phalaenae in the British Museum. 

 Supplement, vol. ii. Catalogue of the Lithosiadae 

 (Arctianae) and Phalaenoididae in the Collection of the 

 British Museum. By Sir George F. Hampson. Plates 

 xlii-lxxi. (London : British Museum (Natural His- 

 tory).) 32s. 6d. 



Splendours of the Sky. By Isabel M. Lewis. 

 Pp. vii+343. (London : J. Murray.) %s. net. 



The United States Forest Policy. By Prof. J. Ise. 

 Pp' 395- (New Haven : Yale University Press ; 

 London : Oxford University Press.) 21s. net. 



Lectures on Modern Idealism. By J. Royce. 

 Pp. xii+266. (New Haven : Yale University Press ; 

 London : Oxford University Press.) 12s. 6d. net. 



The Mediaeval Attitude towards Astrology, particu- 

 larly in England. (Yale Studies in English, No. Ix.) 

 By T. O. Wedel. Pp. vii+168. (New Haven: Yale 

 University Press ; London : Oxford University Press.) 

 \os. 6d. net. 



Some Famous Problems of the Theory of Numbers, 

 and in particular Waring 's Problem. An Inaugural 

 Lecture delivered before the University of Oxford. 

 By Prof. G. H. Hardy. Pp. 34. (Oxford : At the 

 Clarendon Press.) is. 6d. net. 



Anthropology and History. Being the twenty-second 

 Robert Boyle Lecture delivered before the Oxford 

 University Junior Scientific Club on June 9, 1920. 

 By W. McDougall. Pp. 25. (London : Oxford Uni- 

 versity Press.) 2S. net, 



Manuel de Topom^trie. Operations sur le Terrain 

 et Calculs. By J. Baillaud. Pp. vii+222. (Paris : 

 H. Dunod.) 13 francs. 



Bureau of Education, India. Indian Education in 

 1918-19. Pp. ii + 86+plates. (Calcutta: Government 

 Printing- Office.) 1.8 rupees. 



Ministry of Agriculture, Egypt. Report on the 

 Maintenance and Improvement of the Quality of 

 Egyptian Cotton and the Increase of its Yield. By 

 H. Martin Leake. Po. iv + 38. (Cairo : Government 

 Press.) P.T. 5. 



The National Physical Laboratory. Report for the 

 Year 1919. Pp. 152. (London : H.M. Stationery 

 Office.) 55. net. 



NO. 2647, VOL. 105] 



Dictionary of Explosives. By A. Marshall. 

 Pp. xiv+159. (London: J. and A. Churchill.) 155. 

 net. 



The North of Scotland College of Agriculture. 

 Guide to Experiments at Craibstone, 1920. Pp. 44. 

 (Aberdeen : Milne and Hutchison.) 



Ministry of Public Works, Egypt. Report on 

 Psychrometer Formulae based on Observations in 

 Egypt and the Sudan. (Physical Department Paper 

 No; 2.) By E. B. H. Wade. Pp. 11+45-72 + 2 plates. 

 (Cairo: Government Press.) P.T. 5. 



The Journal of the Royal Anthropological Institute. 

 Vol. xlix., July to December, 1919. Pp. 181-370+ 12, 

 (London.) 155. net. 



An Ethno-Geographical Analysis of the Material 

 Culture of Two Indian Tribes in the Gran Chaco. 

 (Comparative Ethnographical Studies, i.) By E. Nor- 

 denskiold. Pp. xi+295. The Changes in the 

 Material Culture of Two Indian Tribes under the 

 Influence of New Surroundings. (Comparative Ethno- 

 graphical Studies, ii.) By E. Nordenskiold. Pp. xvi + 

 245. (London : Oxford University Press.) 20s. net, 

 2 vols. 



Ministry of the Interior, Egypt. Department of 

 Public Health. Reports and Notes of the Public 

 Health Laboratories, Cairo. Egyptian Water Sup- 

 plies. Pp. ii+105. (Cairo: Government Press.) 

 P.T.20. 



CONTENTS. 



PAGE 



Aerial Navieration and Meteorology. By Prof. E. 



van Everdingen 637 



Child Physiology. By J. W. B 638 



Forest Research . . . • . • . • 639 



The Absorption of Light by Organic Compounds . 640 



Our Bookshelf . . 641 



Letters to the Editor:— 



British and Foreign Scientific Apparatus. — Prof. 



W. M. Bayliss, F.R.S 641 



The Separation of the Isotopes of Chlorine. — Prof. 



Frederick Soddy, F.R.S. . . . . 642 



Science in Medical Education. — Prof. Sydney J. 



Hickson, F.R.S 643 



The Mechanics of the Glacial Anticyclone Illustrated 

 by Experiment. (Illustrated.)— Prof. Wm. H. 



Hobbs ... 644 



The Diamagnetism of Hydrogen. — Dr. J. R. Ash- 

 worth ... 64s 



Occurrence of Ozone in the Atmosphere. — J. N. 



Pring 645 



Crystal Structure. {Illustrated.) By Prof. W. L. 



Bragg 646 



Researches on Growth of Plants. IL (Illustrated.) 



By Sir Jagadis Chunder Bose, F.R.S 648 



Popular Natural History. (Illustrated.) ByJ. A. T. 651 



Notes ... 654 



Our Astronomical Column : — 



A New Comet 658 



Publications of the Dominion Astrophysical Observa- 

 tory, Victoria, B.C., Vol. i., No. i . . . . 658 

 Progress in Science and Pharmacy. By Charles 



Alexander Hill 659 



Medical Science and Education ..... . 661 



First Conference of the International Federation 



of University Women 662 



Insect Pests 662 



Investigations of the Upper Air 663 



Bionomics of Giossiiia pa/pah's. ByJ. W. W. S. . . 663 



Dante and Trepidation 664 



Japanese Botanical Work • . 664 



Researches on Egyptian Cotton. By Dr. W. 



Lawrence Balls • . 664 



University and Educational Intelligence .... 665 



Societies and Academies 666 



Books Received 668 



