636 



NATURE 



[July 15, 1920 



By Dr. E. C. Jee, Pp. 24. 3s. net. Series iii. : 

 Hydrography. Vol. i. : The English Channel. 

 Part 4 : The Section from Newhavcn to Caen. 

 Review of the Physical and Chemical Properties of 

 the Surface Waters, and the Variations of these Pro- 

 perties from November, 1903, to May, 1912, in the 

 English Channel from Newhaven to the Bay of the 

 Seinew By Dr. E. C. Jee. Pp. 26. 35. net. 

 Series iii. : Hydrography. Vol. iv. : The North Sea. 

 Part I : From the River Tyne towards the Naze of 

 Norway. Review of the Variations of the Physical 

 and Chemical Properties of the Waters of the North 

 Sea, together with Observations on the Dogger Bank. 

 Bv Dr. E. C. Jee. Pp. loi. 125. net. (London : 

 H'.M. Stationery Office.) 



On Gravitation and Relativity : Being the Halley 

 Lecture delivered on June 12, 1920. By Dr. R. A. 

 Sampson. Pp. 24. (Oxford : At the Clarendon 

 Press.) 25. net. 



Caithness and Sutherland. By H. F. CampbelL 

 Pp. ix+i68. (Cambridge: At the University Press.) 

 45. 6d. net. 



Kirkcudbrightshire and Wigtownshire. By W. 

 Learmonth. Pp. ix+ 149. (Cambridge : At the Uni- 

 versity Press.) 45. 6d. net. 



Creation : Viewed by the Light of Modern Science. 

 A Lecture given by W. Hackney, 1875. Pp. vi + 29. 

 (London : N. G. Hackney.) 



Heredity and Social Fitness : A Study of Differential 

 Mating- in a Pennsylvania Family. By Dr. W. E. 

 Key. Pp. 102. (Washington : Carnegie Institution.) 



The Inscriptions at Copan. By S. G. Morley. 

 Pp. xii + 643+33 plates. (Washington : Carnegie 

 Institution.) 



Department of Agriculture and Natural Resources, 

 Weather Bureau. Annual Report of the Weather 

 Bureau for the Year 19 17. Part 3 : Meteorological 

 Observations made at the Secondary Stations during 

 the Calendar Year 1917. Pp. 360. ' (Manila.) 



Union of South Africa. Department of Mines and 

 Industries. Geological Survey. Memoir No. 13 : 

 Mica in the Eastern Transvaal. By A. L. Hall. 

 Pp. 95+xviii plates. (Johannesburg.)" 75. 6d. 



Type Ammonites. By S. S. Buckman. Part xxii. 

 Pp. 17-18+ 16, plates. (London : W. Wesley and Son.) 



Unconscious Memorv. By S. Butler. Third edition. 

 Pp. xxxix+186. (London : A. C. Fifield.) 8s. 6d. 

 net. 



Luck, or Cunning", as the Main Means of Organic 

 Modification ? An Attempt to Throw Additional Light 

 upon Darwin's Theory of Natural Selection. By S. 

 Butler. Second edition. Pp. 282. (London : A. C. 

 Fifield.) 85. 6d. net. 



The Assessment of Physical Fitness by Correlation 

 of Vital Capacity and Certain Measurements of the 

 Body. By Prof. G. Dreyer, in collaboration with 

 G. F. Hanson. Pp. xi+115. (London: Cassell and 

 Co., Ltd.) \os. net. 



A Geographical Bibliography of British Ornithologv 

 from the Earliest Times to the End of 19 18. By 

 W. H. Mullens, H. Kirke Swann, and Rev. F. C. R. 

 Jourdain. Part v. Pp. 385-480. (London : Witherby 

 and Co.) 6s. net. 



Department of the Interior. Bureau of Education. 

 Statistics of State School Systems, 1917-18. Bv H. R. 

 Bonner. Pp. 155. (Bulletin No. 11, 1920.) (Washing- 

 ton : Government Printing Office.) 



The Tides and Tidal Streams. By Dr. W. B. 

 Dawson. Pp. 43 + viii plates. (Ottawa: Department 

 of the Naval Service.) 



Cocoa and Chocolate : Their History from Planta- 

 tion to Consumer. Bv A. W. Knapp. Pp. xii4-2io. 

 (London : Chapman and Hall, Ltd.) 12s. 6d,. net. 



The Extra Pharmacopoeia of Martindale and West- 

 cott. Revised by Dr. W. H. Martindale and Dr. 

 NO. 2646, VOL. 105] 



W. W. Westcott. Seventeenth edition. In 2 vols. 

 Vol. i. Pp. xxxix+1'115. (London: H. K. Lewis and 

 Co., Ltd.) 27s. net. 



British Museum (Natural History). Economic 

 Series, No. i. The House-fly as a Danger to 

 Health. By Major E. E. Austen. Pp. 20. 3d. 

 Economic Series, No. 3. Fleas as a Menace to Man 

 and Domestic Animals. By J. Waterston. Pp. 20. 

 4d. Economic Series, No. 4. Mosquitoes and their 

 Relation to Disease. By F. W. Edwards. Second 

 edition. Pp. 19. 4d. Economic Series, No. 6. 

 Species of Arachnida and Myriopoda (Scorpions, 

 Spiders, Mites, Ticks, and Centipedes) Injurious to 

 Man. By S. Hirst. Second edition. Pp. 59+3 plates. 

 IS. Economic Series, No. 8. Rats and Mice as 

 Enemies of Mankind. By M. A. C. Hinton. Second 

 edition. Pp. x+67 + 2 plates, is. (London: British 

 Museum (Natural History).) 



Diary of Societies. 



THURSDAY, July 15. 

 Royal Society of Medicine (Dermatology Section), at 5. 

 Chadwick Public Lecture (in Surveyors' Institution), at 5.15.— Dr. N. 



White: Health Conditions in Eastern Europe — Typhus a Serious 



Menace. 

 ROntgkn Society (at University College), at 9. — Dr. W. D. Coolidge : 



Address (Special Open Meeting). 



CONTENTS. PAGE 



Medical Research. By Prof. G. Elliot Smith, 



F.R.S , 605 



Intellectual Stock-taking. By H. W. C 607 



Petroleum Geology, By H. B. Milner 608 



Fuel Problems. ByJ. S. S. B 609 



Hurter and Driffield. By C. J 609 



Our Bookshelf 610 



Letters to the Editor: — 



The Separation of the Isotopes of Chlorine. — D. L. 



Chapman, F.R.S 611 



Anti-Gas Fans. — Hertha Ayrton ; Prof. A. 



Allmand .... 612 



The Stretching of Rubber in Free Balloons. — 



Dr. Henry P. Stevens; W. H. Dines, F.R.S. 613 

 Notes on the Habits of the Tachinid Fly, Sphexapata 



{Milto^ramma) conica. — Oswald H. Latter . 614 

 Temperature Variations at 10,000 ft. — C. K. M. 



Douglas 614 



The Brent Valley Bird Sanctuary.— Wilfred Mark 



Webb 614 



Researches on Growth of Plants. I. {Illustrated.) 



By Sir Jagadis Chunder Bose, F.R.S 615 



Isotopes and Atomic Weights. {Illustrated.) By 



Dr. F. W. Aston 617 



Obituary : — 



Major-Gen. William Crawford Gorgas,K.C.M.G. 620 



Notes . . 622 



Our Astronomical Column : — 



An Easy Method of Finding Latitude ...... 625 



Increasing the Photographic Power of Telescopes . . 625 

 A New Spectropyrheliometer and Solar Measurements 



made with it 625 



British Association : Subjects for Discussion at 



the Cardiff Meeting 626 



Museums Association Annual Conference .... 626 

 The University of Edinburgh : New Science 



Buildings 627 



Lessons from the Smithsonian • . . 627 



The Religion and Origin of the Hawaian People. 



By Sidney H. Ray 628 



Soil Temperatures. By B. A. K 628 



Control of Insect Pests 629 



Scientific and Systematic Pomology 629 



University and Educational Intelligence 630 



Societies and Academies 631 



Books Received 635 



Diary of Societies 636 



