April 7, 192 1] 



NATURE 



191 



tion. An attempt to discover for the dissolved state 

 a law equivalent to Trouton's . law for the gaseous 

 state. Calling p the molecular latent heat of solution 

 and T the temperature which corresponds for the 

 . state of saturation to an osmotic pressure of one atmo- 

 sphere, p/T should be constant if an analogous rela- 

 tion holds. For various salts in solution this ratio 

 . has a value of about 32.— J. Meunier : The principles 

 : of analysis by means of reducing flames ; the detec- 

 ; tion of traces of manganese in the presence of iron 

 or other substances. The material in the form of 

 powder is carried away as dust in a stream of 

 j. hydrogen which is ignited and the flame examined 

 \ spectroscopically. — L. Forsen : The constitution and 

 , systematic representation of the complex derivatives 

 of the moh'bdic acids. — R. Fosse and G. Lande : Syn- 

 theses of cyanic acid and urea by the oxidation in 

 alcoholic ammoniacal solution of phenols and alde- 

 hydes. The production of ammonium cyanate and 

 urea by the oxidation of ammonia and alcohols is 

 favoured by the presence of copper. Thus with ethyl 

 alcohol the yield of urea is increased from 085 to 

 8-32 grams per 100 c.c. of alcohol by the addition of 

 copper salts. Details of the amounts of urea obtained 

 are given for various alcohols, phenols, and alde- 

 hydes. — M. Godchot : Some derivatives of thuyamen- 

 thone. — O. Bailly : The action of epichlorohydrin on 

 disodium hydrogen phosphate in aqueous solution and 

 the stability of a monoglyceromonophosphoric ester. 

 —A. Mallh'e : The preparation of the amines of 

 secondary alcohols. The method of reduction of 

 ketazines by hydrogen in presence of reduced nickel 

 described in an earlier communication has been ex- 

 tended to ketazines of the formula R-CO-R'. Several 

 , new primary and secondary amines have been pre- 

 pared.— ^P. Gaubert : The interference colours pro- 

 duced by thin crvstalline plates. — .'\. Briquet : The low 

 ; country of Picardv north of the Somme : the existing 

 s_hore,line.— R. Dongier : The simultaneous oscilla- 

 tions of temperature and wind at the top of the Eiffel 

 Tower and their relation with the Bjerknes steering 

 surface of a depression. Two temperature charts on 

 different days are given, showing the variations of 

 temperature- at the summit of the tower and at three 

 lowel levels; the variations of the ve1nntie= of the 

 wind at the summit' are also shown. The diagrams 

 prove the existence of a current of warm air set in 

 motion above the colder layers bv forces alwavs pre- 

 sent in a depression. This is in good agreement with 

 the views . of Bjisrknes on the structure of cyclones 

 in movement. — M. Delcambre : A case of sudden 

 filling of an atmospheric depression. — R. SouSges : 

 The embryogeny of the Scrofulariaceae : development 

 of the embryo in Veronica arvensis. — P. Nobeconrt : 

 The action of some alkaloids on Botrytis cinerea. — 

 Mile. D. Kohler : The variation of organic acids in 

 the course of anthocyanic pigmentation. Details of 

 experiments proving that anthocyanic pigmentation is 

 not accompanied by an increase in the amount of 

 organic acids. — E. Convreur and X. Chahovitch : A 

 natural mode of defence against microbe infections 

 in the invertebrates. Micro-organisms (pyocyanic and 

 coli bacilli) are destroyed by the blood and digestive 

 fluids of certain invertebrates. — A. Thooris : The 

 morphological classification of fifty champion athletes. 

 Metric verification by radioscopy. — L. Mercier : 

 Apterina pedestris. The flight muscles in certain 

 Diptera, wingless or with rudimentary wings. — A. 

 Lecaillon : The action exerted by concentrated sul- 

 phuric acid on the eggs of Bombyx mori. — H. Dronin : 

 Changes in the absorption by skin and muscular 

 tissue brought about by the addition of lipoids to 

 stannous solutions. — W. Kopaczewski : A simple ap- 

 paratus for measuring surface tension.— G. Blanc : 

 Experimental researches on the virus of herf>es. 

 NO. 2684, VOL. 107] 



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