615 



In lh!« the iiitinitesimixl qiiantity d\^LJ) (also when l\J) is finite) 

 may be neglected by the side of b^ and the also finite quantity 

 V . 72 •* -2 » ^"<^l we get : 



identical with (3) of § 3. For v .'/^x^ the value R -. C, follows then 

 again from (?), and the conclusions are further as in the cited paragraph. 

 Fo7itanivent sur Clarena. 



Chemistry. — :' Current Potentials of Electrolyte solutions". By 

 Dr. H. R. Kruyt. (Corninunicated by Prof. Ernst Cohen). 



(Gommunicatcd in the meeting of June 27, 1914). 



1. For a proper understanding of the reciprocal action between 

 electrolytes and colloids the knowledge of the capillary-electric 

 phenomena is indispensable'). Researches on the influence of the 

 electi'ohte concentration in these phenomena have indeed been 

 carried out of late years ; Perrin ^) and Elissaeoff ") studied the 

 electric endosmose of electrolyte solntions, Burton ^) determined the 

 influence of electrolytes in various concentrations on the cataphoresis 

 whilst there already exists a vast material on the capillary-electro- 

 meter and the dropping electrode ^). The recent investigations were, 

 therefore, chiefly concerned with the measurement of the phenomena 

 of motion in consequence of a supplied electric tension ; the reverse 

 phenomenon, however, namely the occurrence of an electric tension 

 in consequence of a moving electrolyte solution has been but little 

 studied ^). The former investigations on these current potentials 

 (generally, though less accurately, called "Strömungsströme") are 

 restricted to pure water. True, Chwolson ') states that electrolyte 

 solutions cannot produce current potentials, but from the quoted 

 treatises of Gourp' de \"illemontée ') it appears that the latter oidy 



1) For full details of this problem see H. I'^rkundlich, Kapillarcliemie, Leipzig 

 1909 in very condensed form H. R. Kruyt, Aanteekeningen Prov. Utr. Gen. 3 June 

 1913 p. 9 and Ghera. Weekbl. 10, 524 (191S). 



2) Journal de Ghimie physique 2. 60 f (1904). 

 8). Z. f. physik. Ghem. 79, 3S5 (1912). 



1). Phil. Mag. [6] 11, 425; 12, 472 (1905) and 17, 583 (1909). 



5) Detailed literature statements in Chwolson, Lehrbuch der Physik IV 1. 



'') The most important investigations of recent times are those of Cameron and 

 Oettinger, Phil. Mag. [6] 18, 586 (1909) ; Grumbacti, Ann. de chim. el de 

 phys. [8] 24, 433 (1911) and Riety, ibidem [8] 30, 1 (1913). 



'^) 1. c. note 5. 



«) Journ. de phys. [3] 6, 59 (1897). 



