ON ELECTROLYSIS IN ITS PHYSICAL AND CHEMICAL BEARINGS. 401 



to the meeting-place, SO^ travelled 45-5, in tube No. VI. In tube No. IX. Ba 

 travels 47'8, while SO^ travels 56-6, and so on ; see following table. 



Expeiivients <m travel of both Ba and CI through jelly tubes. 



Four fresh tubes, numbered XII.-XV., each 40 centims. long, and more simply- 

 bent, were tilled with the following jelly, containing sulphate of silver as a test for 

 the presence both of Ba and of 01. The jelly was made by taking 40 cc. of the 

 previous acetic acid gelatine and adding to it 10 cc. of the foUovnng solution, -viz., 

 20 cc. of nitrate of silver sol. (AgNO^ in 50 cc.) + 2 cc. sulphuric acid (H^SO^ in 



' The 3 pairs of bracketed numbers about this date relate to the two ends of the plug of 

 precipitated BaS04, and show the rate at which this plug grew in thickness. 



1886. D D 



