14 McBAIN [iSi4Porrett 



ABSTRACT OF THE LITERATURE OF ELECTROLYTIC 



MIGRATION. 

 1 814. R. Porrett. 



Abstracts Phil. Trans., /, 510, from Phil. Trans., p. 519. On the Nature of 

 the Salts termed Triple Prussiates, and on Acids formed by the Union of certain 

 Bodies with the Elements of Prussic Acid. 



The author observed the movement of Fe and of K in the 

 electrolysis of ferrocyanic acid solution. 



1833. M. Faraday. 



Experimental Researches in Electricity, fifth series, III, Theory of Electro- 

 chemical Decomposition. Phil. Trans., 123, 6S2, 525-530. Ostwald's Klas- 

 siker, 86, 85. Pogg. Ann., 32, 436. 



Two pieces of apparatus, each consisting of two electrode 

 cups connected by a strip of asbestos, were set up in series. 

 One was filled with sulphuric acid of specific gravity 1.02 12, 

 the other with a chemically equivalent solution of sodium sul- 

 phate. Pt electrodes were used and the contents of the four 

 cups were weighed and titrated before and after the electrolysis. 

 The change in acidity in each cup of the sodium sulphate ap- 

 paratus was 24^-3 times as great as in the sulphuric acid appa- 

 ratus. The sulphuric acid contained a small percentage of 

 inorganic sulphates. (From these experiments it would follow 

 that in sulphuric acid w for SO^ lies between .4 and .33.) 



1839. J. F. Daniell. 



On the Electrolysis of Secondary Compounds. In a letter addressed to M. 

 Faraday. Phil. Trans., i2g, 97. 



Apparatus : A vertical U-tube with two diaphragms of bladder 

 in the bend ; tubes were attached to collect the gases from each 

 of the electrodes separately. The current was measured by a 

 water voltameter. In seven electrolyses with i-io percent 

 solutions of sulphuric acid the migration value of the SO^ was 

 found to be n = |. In one of these experiments a Zn anode 

 was employed, in the others Pt electrodes were used. As a 

 result of futher electrolyses, the author concluded that the cur- 

 rent was carried solely by the electrolyte, and adopted Davy's 

 formulas for the oxy-acids and their salts, and those of Berzelius 

 for the ammonium salts. 



