[ 46 ] 
Nor did any occur with 
Lead and iron. 
Lead and gold. 
Lead and copper, 
Lead and zinc, or 
Lead and antimony; 
but with lead and bifmuth flight move¬ 
ments were excited. 
Since that period, I have had an oppor¬ 
tunity of repeating feveral of thefe expe¬ 
riments, and particularly that where the 
coatings were of gold and lilver, and the 
condudtor of a different metal. Very fre¬ 
quently it has difappointed me. If the 
coating is of filver, and the conductor of 
gold, there is very feldom any motion ex¬ 
cited. I have, ’tis true, procured fome 
feeble tranfitory movements two or three 
times in frogs, and twice in fowls, in a 
great number of experiments, but never 
in rabbits or cats. 
With regard to the other metals, there 
are 
t 
