1881.] 



Electrolytic Diffusion of Liquids. 



141 



of phenomena resulting from the passage of an electric current verti- 

 cally through the boundary surfaces of mutual contact of two 

 electrolytes lying upon each other. As it was not possible by means 

 of the apparatus employed in that research to definitely ascertain 

 whether the mass of liquid expanded or moved as a whole in the line 

 of the current, I devised the following arrangement for the purpose 

 of more conclusively testing that question, and to obtain additional 

 •data to assist in explaining the phenomena previously observed. 



A is a glass vessel containing the heavier liquid, B is a glass tube 

 rabout 15 centims. long and 2 centims. diameter, containing the lighter 

 solution, and capable of being raised and lowered by means of the 

 •rack C and a pinion (not shown in the sketch), attached to a fixed 

 upright support. The tube B is closed at the lower end by an 

 india-rubber bung, in a hole in the centre of which is fixed the open 

 glass meniscus tube D, about 16 millims. long, and having a bore of 

 .about 6 millims. ; it is also closed at the top by a perforated bung, 

 through which proceeds an open glass tube E, of somewhat smaller 



