PHYSICAL ano LITERARY. 323 
but, in two minutes more, obferving no 
motion in it, I took it out of the water, 
and laid it ona table, where it remained 
at reft, unlefs when touched. Soon after 
this, however, it began to move; and, at 
twenty-five minutes after immerfion, it 
made 9g pulfes in fixty-three feconds, Four 
minutes after this, it moved oaly thrice isi 
- fifty feconds, and then ceafed altogether ; 
pe eae 
unlefs that, when pricked with the point 
of a knife, it gave one very faint pulfa- 
tion. At forty feven minutes paft eleven, 
‘it was quite dead, 
a 17. I cut out the heart of a fourth frog, 
and, at thirty minutes paft ten, immerfed 
it in a turbid folution of opium in water of 
the fame degree of heat with the fogntain~ 
water ufed in the three laft experiments * 
After this heart had been immerfed ten 
minutes, I took it out of the folution, and 
laid it on a table, but it made not the 
{malleft motion ; and when pricked with - 
i, the point of a knife, though it quickly re- 
covered its fhape, yet it was not excited 
into 
* Viz, Nearly fisty degrees of Farenheit’s thermometer. 
