. 
PHYSICAL anv LITERARY. 32: 
folution of opium, twenty-three minutes 
before one. After it had lain fixteen mi- 
utes, I cut up its ‘borax and pericardium ; 
and, obferving the heart beating very regu- 
larly and pretty ftrongly, 21 times in the 
minute, I immerfed it again in the fo- 
lation, which had now immediate ac- 
cefs to the heart. After five minutes, I 
took it.out of the folution; and, finding 
the héart without motion, | pricked it with 
the point of a knife; upon which it began 
to beat at the rate of 14 times in the mi- 
‘riute, and continued its motions very lan 
suidly,and not without fome interruption, 
for about a quarter of an hour. 
14. [cut out the heart of a frog, and put 
4t in fountain-water at ten minutes paft 
ten 5 immediately after immerfion, it beat 
about 28 times in the minute, Eighteen 
minutes paft ten, it rindi 6 pulfations in 
thirty feconds. Twenty minutes after ten, 
E took it out of the water and laid it on a 
table, and obferved, that, as often as it was 
gently touched with any thing it made 
‘ene fall and ftrong penton, and no. 
Vor}. Sf more: 
