47 2 



NATURE 



[July 3, 1913 



caesium. The value of L/T was about i-68 for all 

 four metals. — Leon Guillet and Victor Bernard : 

 Variations of the resilience of copper and of some of 

 its alloys as a function of the temperature. Curves 

 are given for copper, six brasses, cupro-nickel, Ger- 

 man silver, and two aluminium bronzes. — Rene 1 

 Dubrisay : The neutralisation of chromic acid. — Paul 

 Pascal : Remarks on the additivity of the physical 

 properties in the organometallic series. — A. Colani : 

 Study of the chloro-oxalate of thorium. — J. B. 

 Sendcrens : Oxidation of the alcohols under the influ- 

 ence of heat alone. Ethyl, isobutyl, and isoamyl 

 alcohols are rapidly oxidised by air at temperatures 

 between 380° C. and 450 C. Ignorance of this fact 

 has led to catalytic properties being erroneously 

 assigned to certain substances. — G. Favrel : A new 

 series of isopyrazolones. — G. Andre : The relation of 

 the mineral acids and bases in plant tissues. — C. 

 Gerber ; The latex of Ficus coronata, an incomplete 

 plant pancreatic juice, without amylase, and with 

 proteolytic diastase predominating. Comparison with 

 Ficus carica. — De Gironcourt ; The Gironcourt Ex- 

 pedition, 1908-9. The botanical results. Specimens 

 were collected in Dahomey, Nigeria, Togo, and the 

 Gold Coast. — Paul Dop : The cytology of the miero- 

 pvlar suckers of the albumen of Veronica pcrsica. — 

 M. Guilliermond ; The formation of anthocvan in the 

 middle of the mitochondria. — E. Michel-Durand : 

 Variations in the carbohydrates of leaves in the course 

 of development. — L. Bordas : Anatomical and histo- 

 logical considerations on the Malpighian tubes of 

 some Orthoptera. — L. Leger and O. Duboscq : The 

 evolutive cycle of Porospora portunidarum. — J. Bridre 

 and A. Boquet : Anticlavelous vaccination with sensi- 

 tised virus. Duration of the immunity : applications 

 to vaccination. — A. Trillat and M. Fouassier : The con- 

 tamination of milk by the typhoid bacillus through 

 water. Milk is an extremely favourable medium for 

 the development of the typhoid bacillus. — R. Fosse : 

 The detection of urea in plants. Urea can be pre- 

 cipitated by xanthvdrol in plant extracts, heating or 

 concentration of the solution being unnecessary. — L. 

 Lagane : The action of hydrogen peroxide on the 

 amylase of human milk. — H. Guilleminot : The law 

 of the biological action of filtered and non-filtered 

 X-rays. — Carl Renz : The discovery of the Trias and 

 the Jurassic in the Kopais Mountains (Central Greece). 

 — f. Vallot : The velocity of glaciers in winter. The 

 velocitv of a glacier is the same in winter and summer. 



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DIARY OF SOCIETIES. 



FRIDAY. July 4. 



Geologists' Association, at 8.— A Geological Reconnaissance on the Ea*t 



Coast of the Victoria Nyanza : Dr. Felix Oswald. 



MONDAY, July 7. 



Aristotelian Society, at 8.— Annual Meeting.— The Philosophy of 



Probability : Dr. A. Wolf. 



CONTENTS. p 



An Epitome of Geometrical Crystallography. By 



Prof. Harold Hilton 



A History of Chemistry. By T 



Reproduction and Development. By Dr. Francis 



H. A. Marshall 



Four Zoological Text-books. By J. A. T 



Our Bookshelf 



Letters to the Editor: — 



The Ionisation of Gases in the Schumann Region. — 



A. LI. Hughes . . . 



The Microtropometer. — Dr. G. A. Shakespear . . 



Wireless Antennae. — A. Lander . ... 



, The Occurrence of Anomalocera pattersoui, Temp , 



n Mounts Bav. — Harold Swithinbank ; G. E. 



Bullen . .' 



Artificial Hiss.— Prof. E. B. Titchener ... 

 I The Bicentenary of the Botanic Garden of St. 



Petersburg. By O. S 



The Dawn of Western Civilisation. {Illustrated.) 



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The Divining Rod. By Prof. J. Wertheimer . . 



Dr. P. L. Sclater, F.R.6. By R. L 



Notes 



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The Third International Road Congress 



Opening of the New Wing at Rothamsted. (Illus- 

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The Glasgow Meeting of the Institution of Naval 



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