May 15, 1913] 



NATURE. 



-87 



the methods used were based on different principle-., 

 with one exception (a Lyra), the agreement in the 

 estimated temperatures is close, the differences being" 

 of the order of the experimental error. The results 

 agree with the thermal classification of Sir Norman 

 Lockyer, deduced from the qualitative study of stellar 

 spectra. — J. Guillaume : Observations of the sun made 

 at the Observatory of Lyons during the first quarter 

 of 1913. Observations were possible on sixty-five 

 days, and tables are given showing the number of 

 spots, their distribution in latitude, and the distribu- 

 tion of the faculae in latitude. — Th. Anghelutza : Some 

 remarks on the exponential development of Cauchy. — G. 

 Douligand : Green's function for an indefinite cylinder. 

 M. Hadamard : Remarks on the preceding note. — 

 J. de Boissoudy : The constant of the law of radiation. 

 — G. A. Dima : The influence of the valency of the 

 metal on the photoelectric effect of metallic com- 

 pounds. In all the cases examined the compound in 

 which the metal has the smallest valency appears to 

 have the greatest photoelectric power. — Louis Ridty : 

 The electromotive force produced by the flow of solu- 

 tions of electrolytes through capillary tubes. Data 

 are given for solutions of varying concentrations of 

 potassium chloride, nitrate and sulphate, potash, 

 hydrochloric and sulphuric acids. — C. Gutton : The 

 determination of the time required for the establish- 

 ment of electrical double refraction. The times found 

 ranged from o-6 to 1-4 hundred-millionth of a second. 

 These are of the order of Maxwell's time of relaxa- 

 tion, and agree with the theory that double refraction 

 is the result of a molecular orientation. — H. Magunna : 

 A mechanical means for keeping tuning-forks or 

 plates in continuous vibration. — Em. Vigouroux : The 

 transformations of the alloys of iron and silicon. A 

 discussion of a recent paper by G. Charpy and A. 

 Cornu concerning the transformation point A,. — G. 

 Reboul : Chemical reactions and radii of curvature. 

 It has been shown by the author that the chemical 

 action of a gas. on a solid depends on the form of the 

 latter, the action being greatest at the points where 

 the curvature of the solid is greatest. It is now- 

 found that if two copper wires of different diameter 

 are placed close together in an atmosphere capable 

 of forming a compound with the copper, the fine wire 

 appears to exert a protective action on the coarser 

 wire, the former only being attacked. — Camille 

 Matignon : The preparation of barium. An intimate 

 mixture of barium oxide and silicon in the proportion 

 ;BaO : Si is heated in a steel tube to 1200 C. ; barium 

 is formed, and distils into the cooler portion of the 

 tube. The yield is good, and the metal proved to be 

 of 08-5 per cent, purity. Ferrosilicon with 95 per cent, 

 silicon can replace the silicon. — M. Hanriot and A. 

 Kling : The action of reducing agents on the chlora- 

 luses. Sodium and aluminium amalgams were used 

 as reducing agents; compounds containing one and 

 two atoms of chlorine were isolated and described. — 

 A. Wahl and P. Bagard : Syntheses in the indigo 

 group. — Marcel Lantenois : The preparation of carbon 

 tetraiodids. Two methods were found practicable, the 

 interaction of carbon tetrachloride and lithium iodide 

 and the action of hypochlorite upon iodoform in 

 stronglv alkaline solutions. An advantageous method 

 of purifying the crude product is given. — C. Gaudefroy : 

 Dehydration figures. — Aug. Chevalier : The botanical 

 origin of commercial Gabon woods. — J. Beauverie : 

 The question of the propagation of rust in the 

 Graminaceae. The presence of mycelium, uredo- 

 spores, or teleutospores of rusts in the interior of the 

 seeds of cultivated Graminaceae is* very common, and 

 it is necessary to take this fact into account in the 

 studv of the question of the propagation of rust. — E. 



NO. 2272, VOL. 91] 



Perrot : Observations on the preparation of cocoa. 

 Improvements are suggested on the method of pre- 

 paring the cocoa bean for the market in current use. — 

 A. Pinard and A. Magnan ; Researches on sexuality in 

 births. — Henri Beclere ; Pressure and thermometry in 

 cryotherapy. An iron-constantan thermocouple has 

 given good results, not only in determining the tem- 

 perature in the freezing mixture (solid carbon dioxide), 

 but also the temperature at the surface of application. 

 — Pierre Girard : The osmotic relations of the red 

 corpuscles with their medium : role of the electric 

 state of the wall.— Auguste Lumiere and Jean 

 Chevrotier : The action of oxidising agents in general 

 and alkaline persulphates in particular on the tetanus 

 toxin. Remarks on a recent note by Marcel Belin. 

 Details are given of the success attained in the treat- 

 ment of tetanus by injections of sodium persulphate. 

 — Jacques Surcouf :' The transmission of the larvae of 

 Dermatobia cyaniventris by a mosquito. — Albert 

 Robin : The retention of chlorides in the liver and the 

 blood of cancerous subjects. — E. Voisenet : Cream of 

 tartar as a food for the ferment causing bitterness in 

 wine. The Bacillus amaracrylus can utilise sugars 

 and glycerol as food, but is inactive in presence of 

 tartaric acid and its salts.— G. Malfitano and Mile. A. 

 Moschkoff : Pseudo-crystals of starch and crystals of 

 glucose. — H. Labre and R. Maguin ; Contribution to 

 The studv of the conditions of precipitation of albumen 

 by picric acid. Working with a constant excess of 

 picric acid, the relation between the amount of albumen 

 present and the quantity of picric acid combined with 

 it is not a linear one, but can be represented by an 

 equilateral hvperbola. The phenomenon would appear 

 to be one of' adsorption, but it can be made the basis 

 of a practical method for the estimation of albumen.— 

 jran Chautard : The origin of petroleum at Wyoming. 

 —J. Bosler : Magnetic storms and hysteresis 

 phenomena. 



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