March 31, 192 1] 



NATURE 



159 



particles and the velocity of currents of water main- 

 taining the particles in suspension. Six different 

 minerals were used, and it was found that when the 

 section of the particles was small compared with that 

 of the tube, Stokes's law was applicable.— A. Perot : 

 Measurement of the pressure of the solar atmosphere 

 in the magnesium layer and the verification of the 

 principle of relativity. — H. Soulan : The influence of 

 light on the conductivity of fluorescent liquids.— 

 P. L. Mercanton : The application of stereoscopic 

 vision to the control of glacial variations. The ap- 

 plication of stereoscopic vision to two photographs 

 taken with the same camera and from the same spot 

 at an interval of a year showed clearly the changes 

 in the Orny glacier. — M. Pauthenier : New applica- 

 tions of the method of charges of verv short duration 

 and instantaneous lighting. — F. Michaud : Study of the 

 energy of a system of currents. — H. Chipart : The 

 apparent mutual actions of magnets and currents 

 plunged in a magnetic liquid. — J. Barbaudy : The 

 properties of diagrams. Curves representing the dis- 

 placement of equilibrium of chemical systems. — P. 

 Chevenard : The action of additions on the expansion 

 anomaly of the ferro-nickels ; application to the iron- 

 nickel-chromium alloys. The hypothesis of the forma- 

 tion of the compound Nio.Crj serves to explain the 

 marked effect exerted by chromium on the expansion 

 anomaly of the ferro-nickels.— S. Posternak : The 

 systematic nomenclature of the molybdates. A 

 criticism of a recent communication by Forsen on the 

 same subject.— E. Toporescu : The removal of lime 

 and magnesia from solution by precipitates of 

 chromium hydroxide. The limiting quantities re- 

 moved are those corresponding to the formation of 

 3CaO.Cr,0, and 3MgO.Cr,0.,. Both the lime and 

 magnesia can be removed by washing the precipitate 

 with boiling 5 per cent, solution of ammonium 

 nitrate.--M. Legrand : The estimation of maltose and 

 lactose in presence of other reducing sugars. Use of 

 Barfoed's solution. Details of the method are given, 

 with examples of its application to the studv of the 

 products of the germination of seeds and to the 

 analysis of milk. — R. Chudeau : The changes in the 

 climate of the Sahara during the Quaternarv period.— 

 R. de Litardiere : The dimorphism"of the chromosome 

 elements in Polyf>odhim Schneideri during the telo- 

 phase and interphase periods. — H. Coupin : A stem 

 with horizontal geotropism. With certain species of 

 lentil cultivated in the dark the stems grow in the 

 horizontal direction. If, after the stem has com- 

 menced to grow, it is placed vertical, fresh growth is 

 still horizontal. If the seeds germinate in davlight 

 the stem grows verticallv. — L. Daniel : Grafts of the 

 sunflower on the Jerusalem artichoke.— J. Dufrenoy : 

 The influence of the temperature of the thermal waters 

 of Luchon on their flora. Onlv the thiobacteria of 

 verv small diameter can live in the hottest springs 

 C;o° to62°C.). The formation of sulohur is especiallv 

 marked between 40° and 50° C— E. Chemin : The 

 action of n parasitic fungus on Dilsea edulis. — L. 

 Bordas : The general morohologv and structure of 

 (the digestive apoaratus of the Lepidoptera.— L. Page : 

 ^Some spidej^s without pulmonary sacs. A description 

 fOf the spTHer Telema tenella, found in the St. 

 LMary Cave, near La Preste. in the eastern Pvrenees. 

 fThis spider is blind, and the lungs are replaced bv 

 Itrachean stigmata. The author in 1013 put forward 

 Ithe view that T. tenella was the survivor of an extinct 

 rfauna. and this is confirmed bv the discoverv bv MM. 

 .Alluaud and Jeannel in eastern Africa of a new form. 

 Aoneumonella.— L. Berlin : Preliminary note on the 

 idea of species and variabilitv in the sticklebat. — A. 

 Peyron : Tumours of the interstitial gland of the 

 testicle of the horse. 



NO. 2683, VOL. 107] 



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