1906 Eisenstein] ABSTRACT 67 



1905. C. Tubandt. 



Uobcr die alkalischcn Kohaltoxvdiillosungen. Zcit. anorg. Chem., 4j, 368. 



The blue solution obtained by dissolving cobaltous hydroxide 

 in concentrated potash or by the electrolysis of strong potash 

 with a cobalt anode contains the cobalt (or hydroxide) only as 

 colloid, for it does not dialyse through parchment into concen- 

 trated potash; when a current of o.i ampere was passed 

 through the solution placed in the lower half of a U-tube both 

 arms being filled with potash solution the blue layer did not 

 move perceptibly in several hours ; in 36 hours all the cobalt 

 was precipitated, mostly as metal on the cathode, some as oxide 

 in the anode compartment, none on the anode. Addition of 

 gl3xerine has no influence on any of these phenomena. 



igo6. H. Jahn's Pupils. 



For the following series I am indebted to the courtesy of 

 Professor Jahn, who voluntarily sent me his own copies of the 

 dissertations, as they are out of print. He expects to publish 

 them together in the Zeit. phys. Chem. in the course of the 

 present winter. 



Apparatus and method the same as in the 1901 series ; 

 capacity of anode compartment 300-800 c.c. ; anode Cd or Zn,. 

 cathode Hg covered with a concentrated solution of CdSO^ or 

 sometimes ZnClg. 



E. Berliner. 



Dissert., 1902. 



Ag anode, cathode Hg covered with Cu(N03)2. 



The paper further contains measurements of the transport 

 in mixtures of AgNOg and KNO3 showing that the mobility of 

 the Ag ion is not appreciably affected by the presence of the 

 potassium nitrate. 



AgNOg 0.498m 18° o.8gAg 



0-5 

 0.5 

 0.4 



0.1-0.4 

 0.3-0.7 



A. Eisenstein. 



Dissert., 1902, quoted bj Roth, Zeit. phjs. Chem., 42, 210. 1903. 



The middle layer of solution never showed the least trace of 



