NATURE 



[.Septembb;r 25, 1919 



Metcalf's comets made with the cowii equatorial at 

 the Observatory of Lyons. Observations of each 

 comet were made on August 28. — G. Sagnac : The 

 aether and the absolute mechanics of waves. — J. 

 Rey : .\ lighthouse of groat power, arranged with 

 metallic mirrors. A description of the optical arrange- 

 ments adopted at a lighthouse erected off the coast of 

 Tunis. Metal reflectors only wore used, without 

 glass. Details of the photometric measurements and 

 range are given. — Ch. Mauguin and L. J. Simon : 

 Cyanogen chloride. .\ review of the methods sug- 

 gested^ fo!' the preparation of cyanogen chloride, 

 including three new electrolytic methods,' based on the 

 electrolysis of a mixture of hydrochloric and hvdro- 

 cyanic acids. The cure liauid chloride solidified at 

 -6-5° C, and boiled at 12-5° C. The onlv other 

 cyanogen chloride is the solid polymer melting at 

 145° C — Ch. Pussenot : New observations concerning 

 a recent submersion of the coasts of Morbihan. — M. 

 Leriche : The fossil fishes of the coast region of the 

 Congo, and on the presence of the Eocene in this 

 region. — L. Blaringhem : Vigour of growth, com- 

 pensating sterility, in the hybrids of species of 

 Digitalis (Digitalis purpurea: D. lutea). The hybrids 

 between species of Digitalis are absolutely sterile, 

 but there is an excessive development of the plant- 

 tissues with all the characters of young, super- 

 nourished organs. — E. Roubaud : The antagonism of 

 cattle and man in the blood nutrition of Anopheles 

 \naculipennis. The anti-paludic rdle of domestic 

 cattle. When the mosquito has choice of man or 

 domestic animals, it attacks the latter for preference. 

 In order of preference, mosquitoes go first to nigs, 

 then cattle and horses, then .sheep, rabbits, and dogs. 

 Fowls are not touched. When there are nlentv of 

 cattle adjacent to a house, the mosquito is not found 

 in the house. — G. Bertrand and M. Das.sonville : The 

 treatment of scab in horses bv the vaoours of chloro- 

 picrin. Chloropicrin has been successfully applied to 

 the cure of scab in horses; it possesses advantages 

 over the sulphur dioxide treatment. 



BOOKS RECEIVED. 



Mind and its Disorders : A Text-book for Students 

 and Practitioners of Medicine. By Dr. W. H. B. 

 Stoddart. Third edition. (Lewis's Practical Series.) 

 Pp. xx + 580. (London : H. K. Lewis and Co., Ltd., 

 1919.) i8x. net. 



An Elementary Course of Infinitesimal Calculus. 

 By Prof. Horace Lamb. Third edition, revised. 

 Pp. xiv-i-530. (Cambridge: .\t the L'niversitv Press, 

 191Q.) 20.S. net. 



The Study of the Weather. By E. H. Chapman. 



iThe Cambridge Nature Study Series.) Pp. xii+131. 

 Cambridge : .\t the LIniversitv Press, 1919.) 3.S. 6(7. 

 net. 



An Enquiry Concerning the Principles of Natural 

 Knowledge. By Prof. A. N. Whitehead. Pp. xii+ 

 200. (Cambridge : .At the University Press, 1919.) 

 12s. 6d. net. 



Aeroplane Structures. Bv A. J. Sutton Pippard 

 and Capt. J. Laurence Pritchard. With an introduc- 

 tion by L. Bairstow. Pp. xii-t-^ijq-l-xxi plates. 

 (London : Longmans, Green, and Co., 1919.) 21.?. 

 net. 



The Natural History of South Africa. By F. W. 

 Fitzsimons. Mammals. Vol. i., pp. xix-l-178. 

 Vol. ii., pp. xi+195. (London: Longmans, Green, 

 and Co., 1919.) qs. each vol. 



Principles of Electric Spark Ignition in Internal 

 Combustion Engines. By J. D. Morgan. Pp. vii4-88.j 

 (London : Crosby Lockwood and Son, 1920.) Ss. 6d. 

 net. 



NO. 2604, VOL. 104] 



Ireland : The Outpost. By Prof. G. A. J. Cole. 

 Pp. 78. (London : Oxford University Press, Hum- 

 phrey Milford, 1919.) 35. 6d. net. 



The Stanton Drew Stones. By E. Sibree. Pp. 20. 

 (Bristol : J. W. .'^rrowsmith, Ljtd., 1919.) is. 



Geology of India for Students. Bv D. N. Wadia. 

 Pp. xx-l-3984-xx plates. (London: Macmillan and 

 Co., Ltd., 1919.) iSs. net. 



Mendelism. By Prof. R. C. Punnett. Fifth edi- 

 tion. Pp. xv-l-2i9-)-vii plates. (London: Macmillan 

 and Co., Ltd., 1919.) ys. 6d. net. 



Proceedings of the .Aristotelian Society. New 

 series. Vol. xix. Containing the Papers read before 

 the Society during the Fortieth' Session, 1918-19. 

 Pp. iii-l-311. (London : Williams and Norgate, 1919.) 

 20,?. net. 



.Aristotelian Society. Supplementary vol. ii. 

 Problems of Science and Philosophy. The Papers 

 read at the loint Session of the .Aristotelian Society, 

 the British Psychological Society, and the Mind .Asso- 

 ciation, held at Bedford College. London, July 11-14, 

 1919. Pp. iii4-22o. (I^ondon : Williams and Norgate, 

 1919.) I2X. 6d. net. 



Guide to the Study of the Ionic Valve : Showing 

 its Development and .Application to Wireless Tele'- 

 graphy and Telephony. By W. D. Owen. Pp. vii-(- 

 59. (London : Sir Isaac Pitman and Sons, Ltd., n.d.) 

 2,<;. 6a. net. 



The Essentials of Chemical Physiology for the Use 

 of Students. By Prof. W. D. Halliburton. Tenth 

 edition. Pp. xi + 324. (London : Longmans, Green, 

 and Co., 1919.) 7-s. 6d. net. 



CONTENTS. PAGE 



The Missing Theme. By M. A. C. H 69 



Water in Action— Controlled and Free. By Dr. 



Brysson Cunningham .70 



Mammalian Physiology. By H. H. D 71 



Our Bookshelf ... 72 



Letters to the Editor:— 



National Representation upon International Councils. — 



Dr. Norman R. Campbell . 72 



Intravenous Injections of Gum Solutions in Cholera. — 

 Sir Leonard Rogers, C.I.E., F.R.S. ; Prof. 



\W. M. Bayliss, F.R.S 73 



A Photoelectric Theory of Colour Vision. — Prof. J. 



Joly, F.R.S 74 



Mathematics at the University of Strasbourg. — H. 



Bryon Heywood 74 



The Magnetic Storm of August 11-12, 1919. — Alex- 

 ander Graham Bell 74 



The Watt Centenary Celebrations . 74 



Prof. J. W. H. Trail, F.R.S. By F. O. B 76 



Notes ■ . 77 



Our Astronomical Column : — 



Comets So 



The Future of the Transit Circle So 



Heredity and Evolution. By Prof. G. H. Carpenter, Si 



Chemistry of " Burgundy Mixture " 82 



/Ether and Matter: Being Remarks on Inertia, and 

 on Radiation, and on the Possible Structure of 

 Atoms. Part II. By Sir Oliver J. Lodge, F.R.S. . 82 



University and Educational Intelligence 87 



Societies and Academies 87 



Books Received 88 



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