June 2, 1921] 



NATURE 



447 



ledge of the internal pressures. — H. Abraham and R. 

 Planiol : The use of the Baudot telegraph in wireless 

 telegraphy. The Baudot quadruple instrument used 

 in the ordinary way records 7200 words per hour. A 

 description of the adaptation of this to wireless trans- 

 mission is given. The first experiments were made 

 across Paris ; later the apparatus was successfully used 

 between Paris and Nogent-le-Rotrou. — M. St. Procopiu : 

 Electrical double refraction of mixed liquids and 

 crystalline structure. — A. E. Lindh ; The absorption 

 spectra of chlorine for the X-rays. All chlorides in 

 which the chlorine is monovalent have similar X-ray 

 spectra, but there is a displacement of the limits of 

 absorption in KCIO3 and KCIO,, compounds in which 

 the valencies are 5 and 7. — D. Coster : The principle of 

 combination and the law of Stokes in the X-ray series. 

 —MM. M. Menard and Pestel : Concerning the danger 

 of radiological installations. The authors conclude 

 that, provided the usual precautions required for the 

 safety of the operator are taken, there is no real danger 

 to third parties in neighbouring rooms. — A. Tian : A 

 theory of the slow hydrolvsis of salts. — MM. P. Jolibois 

 and Bouvier : The reversibility of the reaction CaC03 = 

 COj+CaO. The self-recording apparatus described 

 in an earlier paper has been applied to the study of 

 the dissociation of calcium carbonate. The heating 

 and cooling curves are not the same, and hence the 

 reaction is not strictly reversible. — G. Dupont : Con- 

 tribution to the study of the acid constituents of the 

 exudation of the maritime pine. The composition of 

 pimaric acid. Pimarlc acid purified bv Vesterberg's 

 method is a mixture of 37 per cent, of dextropimaric 

 acid and 6-^ per cent, of the laevo-acid.^L. Long- 

 chambon : The measurement of the rotatory power 

 in biaxial crystals. — L. Cayeux : The petrograbhic rdle 

 of fossil Alcyonaria deduced from the analysis of the 

 Jurassic iron minerals of France. — L. Joleaud : A 

 deep boring which demonstrates the existence of 

 transported strata in northern Tunis. A trial boring 

 for oil made at Ain-Rhelal started in the Middle 

 Miocene, then passed through the Trias C630 metres), 

 and finally met with strata undoubtedly belonging to 

 the Upper Cretaceous. — F. Ehrmann : ' The Trias of 

 the Kabvlie des Babors ('Algeria). — J. Beauverie : The 

 resistance of mitochondria and plasts, and relations 

 with attacks by parasites. — G. Mangenot : The struc- 

 ture of the antherozoids of the Fucaceae. — R. Lance : 

 The use of coloured screens for fighting against 

 cryptogamic diseases of plants. The plants are 

 sorayed with solutions containing blue, green, and 

 violet dye. The fluid dries and leaves the parts of the 

 plant covered with a colour screen allowing blue, 

 violet, and ultra-violet light to pass. No results of 

 the treatment are given. ^ — R. Lance : An anticrypto- 

 gamic product. A proposal to use salts of zinc for 

 spraying plants. — M. Mirande : Seeds giving hydrogen 

 sulphide by fermentation belonging to the family of 

 the Papilionacese. Many leguminous seeds, including 

 beans, peas, and lentils, when moistened with water 

 undergo a spontaneous fermentation, one of the pro- 

 ducts of which Csulphuretted hydrogen) is poisonous. — 

 C. Champy : The experimental change of sex in Triton 

 alpestris. A male, subjected to starvation, had its 

 testicle replaced by a fatty band containing neither 

 spermatocytes nor spermatozoids. Two animals after 

 winter starvation were intensively fed. The external 

 colouring changed from male to female in character. 

 One of these was killed, and showed the adipose 

 band ; the second, killed two months later, showed a 

 genital gland (section shown in diagram) correspond- 

 ing to the ovary of a young female. — L. Roule and 

 F. Angel : Fishes of the family of the Diretmideae and 

 their place in classification. — A. Gruvel : The geo- 

 graphical distribution of some Madagascar! lobsters 

 NO. 2692, VOL. 107] 



and their commercial exploitation. — J. Dragoiu and 

 F. Vlis : The cytological consequences of the osmotic 

 arrest of cell division. The increase of the external 

 osmotic pressure first retards, then stops, the division 

 of the cytoplasm. With additional increase of osmotic 

 pressure the internal evolution of the cell is progres- 

 sively changed in a regular manner. The whole pro- 

 cess simulates a kind of regression of nuclear evolu- 

 tion. — M. Doyon : The use of chloroform for the pre- 

 paration of nucleo-proteids and nucleic acids active in 

 vitro on the blood. The complexity of the action of 

 the nucleic acids in vitro. — M. Bordier : The useful- 

 ness of diathermal d 'Arson valisation in atonic wounds. 



Books Received. 



The Works of Aristotle. Translated into English 

 under the editorship of W. D. Ross. Vol. x. : Poli- 

 tica. By Benjamin Jowett. Oeconomica. By E. S. 

 Forster. Atheniensium Respublica. By Sir Frederic 

 G. Kenyon. Unpaged. (Oxford : Clarendon Press.) 

 155. net. 



Insects and Human Welfare. By Prof. Charles T. 

 Brues. Pp. xii+104. (Cambridge, Mass. : Harvard 

 University Press ; London : Oxford University Press.) 

 los. 6d. net. 



Fugitive Essays. By Josiah Royce. Pp. 429. 

 (Cambridge, Mass. : Harvard University Press ; 

 London : Oxford University Press.) 175. net. 



Aeroplane Performance Calculations. By Harris 

 Booth. (The D.-U. Technical Series.) Pp. xv+207. 

 (London : Chapman and Hall, Ltd.) 21s. net. 



Landscape Gardening. Bv Andrew J. Downing. 

 Tenth edition, revised by Frank A. Waugh. Pp. 

 xv+439. (New York : j- Wiley and Sons, Inc. ; 

 London : Chapman and Hall, Ltd.) 36^. net. 



The Study of Geological Maps. By Dr. Gertrude L. 

 Elles. (Cambridge Geological Series.) Pp. viii+74+ 

 vii plates. (Cambridge : At the University Press.) 

 J2S. net. 



The Journal of the Royal Anthropological Institute. 

 Vol. 1., 1920, July-December. Pp. x+237-465r|-i2 + 

 plates. (London : Royal Anthropological Institute.) 

 15^. net. 



The Relative Value of the Processes Causing Evolu- 

 tion. By Dr. A. L. Hagedoorn and A. C. Hagedoorn- 

 Vorstheuvel la Brand. Pp. v+294. (The Hague : M. 

 Niihofi".) 9 glds. 



The ^ Reign of Relativity. By Viscount Haldane. 

 Pp. xxiii+430. (London : J. Murray.) 21s. net. 



Memoirs of the Geological Survey : England and 

 Wales. The Water Supply of Buckinghamshire and 

 of Hertfordshire from LTnderground Sources. By W. 

 Whitaker. Pp. iv+368. (Southampton : Ordnance 

 Survey Office; London : E. Stanford, Ltd.) i6s. net. 



The Banana : Its Cultivation, Distribution, and 

 Commercial Uses. By William Fawcett. Second and 

 enlarged edition. Pp. xi+299. (London : Duckworth 

 and Co.) i>5. net. 



Diary of Societies. 



THTTRSDAr. June 2. 

 lyDTJSTRiAi, WEtrAHE SOCIETY (at 51 Palace Street, S.W.I), at 10.30.— 



Pr. R. M. Wilson : Medical Service in Industry. — Prof. E. L. 



Collis, Dr. T. M. Leg-ge, and Dr. H. Ross : Discussion on Health 



Problems in Industry. 

 RoTAi. Society op Medicine (Laryngology Section) (Summer Meet- 



ine), 2.30 to 6. 

 RoYAi, Institution- or Gheat Britain, at 3. — Sir Alexander C. Mac- 

 kenzie : Beethoven. 

 Institute or Pathology and Research fat St. Mary's Hospital), at 



4..30. — Prof. G. Dreyer : A New Departure in the Serum Diagnosis 



of Syphilis. 

 RoYAt Society, at 4.30.— Dr. T. M. Lowry and Dr. C. P. Austin : 



Optical Rotatory Dispersion (The Bakerian Lecture). 

 Linnean Society, at 5. — Prof. Garstang and Others : Discussion on 



Biogenetic Law (Recapitulation). 



