- PHYSICAL anv LITERARY. 313 
mute; its pulfations, however, were not. 
now fo regular as to time, as they had 
been before. 
- Ts it not probable, that the auricle of 
this frog’s heart beat longer than ufual, 
becaufe it continued, to the laft, to be fil- 
Jed with blood; whereas, generally, the 
y auricles of frogs hearts, which are opened 
after decollation and the deftruction of 
their fpinal marrow, expell, after fome time, 
the blood which they contain, and acquire 
the appearance of a {mall pellucid blad- 
peer filled with air? 
-. I laid- bare the abdominal mufcles 
z baa thorax of a frog, by difleCting off the 
fkin, and, at twenty minutes before nine 
in the morning, Iimmerfed the whole bo- 
dy of the frog in a turbid folution of 
op’ ‘ym in water, ina {mall bafon, which I 
covered, to prevent the frog from leaping 
out of it. Thirty five minutes after im- 
~ merfion, I took it out of the folution and 
_ opened the thorax and pericardium. ‘The . 
-heart’s auricle, which was much diftend- 
ed with bloud, beat 15 times in a minute, 
ke but the heart itfelf, only 6 times. Forty 
Vor. Il. Rr minutes 
