[ 3>8 ] 
If we take two prepared frogs, one coated* 
the other ferving as chain, and eftablilh & 
communication between them by means 
of a metallic conductor, the former (I have 
faid in the courfe of my work) falls into 
convulfions, whilft the other remains mo® 
tionlefs. On making new trials, I find this 
is not the cafe. The frog which is not 
coated frequently gives Ihocks, and what 
appears more fingular, fometimes the other 
remains without motion. Several other cu¬ 
rious accidents I have met with, which I 
lhall communicate as foon as I fhall have 
collected a fufficient number. 
In a letter I wrote to Dr. Simmons, 
I faid that electricity has probably a great 
ihare in the production of animal heat. 
The following reafons induced me to take 
up this idea. 
The degrees of heat do not always cor- 
refpond with the velocity of the circulation. 
Animals 
