f 8 3 
floor. Confiderable movements were ob» 
ferved in the animals, whether of cold 
or warm blood, whenever it lightened. 
Thefe preceded thunder, and cone-, 
fponded with its intenfity and repetition, 
and even when it, did not lighten, the 
movements took place when any ftormy 
cloud pa(Ted over the apparatus. 
Profeffor Galvani one day fufpended 
fome frogs, perhaps with limilar views, 
on metal hooks, fixed in the fpine of the 
back, upon the iron railing of his garden i 
feveral times he remarked that thefe ani¬ 
mals contracted, and appeared to receive 
fhocks i at firrfc he conceived the move¬ 
ments were owing to changes in the at* 
mofphere, but a more fcrupulous examina¬ 
tion undeceived him. Having placed a 
prepared frog upon an iron plate in his 
room, and happening with his difledting 
forceps to prefs it againfi; the plate, he 
obferved the movements to take place. 
This 
