PHYSICAL anp LITERARY. 311 
5. AT nine minutes paft eleven in the 
forenoon, immediately after decollating 
another frog, I deftroyed its {pinal mar- 
row with a red hot wire, which produced 
terrible convulfions in all the mufcles, as 
in the laft experiment. I opened the ¢ho- 
rax of this frog thirty five minutes after 
decollation, and obferved its ‘heart beat- 
ing 30 times in aminute. The contrac- 
tion of the auricle régularly ‘preceeded 
that of the heart: The ‘auricle was not 
near fo much diftended with blood, nor 
the heart fo much fwelled, ‘as-‘in thofe 
frogs which had a folution of opium in- 
jected into their f{tomach and guts *. At. 
one o'clock (wiz. an hour and fifty one 
minutes after decollation) the heart of 
this frog made 20 pulfations in a minute. 
At half an hour paft two, when the room 
was become warmer by the fhining of the 
fun, it beat 25 times in a minute; and, 
when placed in the fun-beains, it pefform- 
éd 31 contractions ‘in that time, After 
this, I removed the frog to an eaft window, 
" ‘where 
* See No, 3. above, and Effay on the Vital and other 
involuntary Motions of Animals, p 371. and 372. 
