PHYSICAL AND LITERARY. 2'S3 



^e mufcles, efpecially thofe of the inferior 

 extremities. Ten minutes after this, I opened 

 the ihoraXy and fourid the heart beating at 

 the rate of 45 times'iri airiinute. Sixteen mi- 

 nutes after decbllation, it mo\'ed 40 times iti 

 a minute. After half an hour it made 36, 

 and after fifty minutes only 30 pulfations in 

 the minute, which were now alfo become 

 very fmall and feeble. 



A^. B. When I opened the thorax of 

 a-nother frog immediately after decollation, 

 a-nd deftroying its fpinal marrow, I obferved 

 its heart beating at the rate of 60 in a mir 

 n-ute, which is four or five pulfations lefs 

 than I hav€ generally- feen the hearts ot 

 frogs make in that time, when their thorax 

 was opened without decollation. 



5. At nine minutes paft eleven in the 

 forenoon, immediately after decollating an- 

 other frog, I deftroyed its fpinal marrow- 

 with a red hot wire, which produced ter- 

 rible convullions in all the mufcles, as in 

 the laft experiment. I opened the thorax of' 

 this frog thirty Jive minutes after decollation, 

 and obferved its heart beating 30 times-in a 

 minute. The contradlion of the auricle re- 

 gularly preceeded that of the heart:: the 



auricle 



