VOLTAIC BATTERY. 275 



supernatant naphtha, and remained there in a 

 quiescent state until the following evening, when 

 it was again used with facility : no loss having 

 occurred, of any consequence, except in the 

 giving way of three membranes. 



It was found that, for delicate experiments with 

 one pair, goldbeaters' skin, or turkey's craw is 

 considerably more efficient than bladder : decom- 

 position of water is scarcely perceptible when the 

 latter is employed. 



