Influence of Voltaic Currents on the Diffusion of Liquids. 75 



which had been rubbed up with, it, taking care not to use sufficient to 

 block up the finer tubes. After filling the apparatus with the liquid, 

 the tube was wound tightly upon a narrow cylinder to expel 

 bubbles of air, and then unwound. The apparatus being now placed 



Fig. 5. 



so that the tube P was in a strong light, the liquid in that tube was 

 closely examined by means of an eyeglass. As soon as the flow of 

 liquid (arising from inequality of level) ceased, the wires S and T 

 were connected with a voltaic battery, and the liquid in the tube 

 again closely watched, in order to detect any flow, both whilst the tube 

 remained open throughout, and also whilst closed, by means of a 

 pinch- tap. 



With the tube P 15 millinis. long, arid 1*3 millim. internal diameter, 

 and the apparatus filled with a mixture of 19 measures of water, 

 and 1 of pure sulphuric acid, not the slightest horizontal movement 



