i 30 ] 
over the furface of the thigh, I brought 
them to touch the coating, on which con¬ 
tractions took place in the whole leg j fre¬ 
quently the convulfions were commu¬ 
nicated to the other leg, and fometimes to 
the whole body. The fliocks were ftill 
ftronger, when a piece of lead was pafled 
round the abdomen of the animal, and 
the filver money placed under the pelvis. 
Thefe experiments generally fail of fuc- 
cefs when the frogs have been kept for a 
confiderable time, and when attempted in 
a room where there are many perfons. 
The feafon, along with the Hate of the 
atmofphere, has like wife an influence 
upon them, 
What takes place in frogs, one would 
prefume Ihould occur equally in other 
animals,! and in man himfelf.—I have 
accordingly more than once made myfelf 
the fubjeCt of experiment, but have never 
fucceeded. 
Infants 
