I 
[ 2 3 3 
I was in the habit of preparing frogs, 
and leaving them in this fltuation for 
feven, nine, and fometimes twelve hours. 
When I wifhed to examine them, I armed 
> v \ , 
the nerves, and eflablifhed afterwards the 
ordinary communication with a metallic 
arch; fometimes they fhewed flight 
Ihocks, at others, none at all. To know 
if any portion of life ftill exifled, it was 
neceflary to fhift the coating lower down, 
that is nearer the extremity of the limb, 
and it is only within a fhort time that I 
have been aware of the importance of this 
precaution, and fince have made feveral 
experiments to afllire myfelf of the reality 
of the fadt. The refults have been dif¬ 
ferent, and this was to be expedted from 
the difference in the conflitution of the 
animals, and in the ftate of the atmofphere. 
I have feen three remarkable in fiances of 
this occurrence, 
C 4 
Exppri 
