FHYSICAL Am LITERARY. 2&7 



frog was taken out of the folution of ophtmy 

 its heart moved only thrice in feventy five 

 feconds, and performed its fyflole very flow- 

 ly. Before two o'clock afternoon the heart 

 was quite dead ; but how long, I canpot, 

 fay, not having had leifure to obferve it from' 

 a quarter before twelve to. near two. ^ . -; 

 7. After cutting off a frog's head and) 

 deftroying its fpinal marrow with a red hot 

 wire, I laid bare the abdorhinal mufcles.and 

 thorax^ as in the lafl experiment, and immer- 

 fed the whole body of the frog' in a turbid, 

 folution of opium J 2X. half an hour pafl nine in; 

 thf morning. Thirty fix minutes after im-f 

 meriion I took it out of the folution, and; 

 opened its thorax and pericardium. The 

 heart and its auricle beat, each,, twenty fix 

 times in a minute, ;. and 'the pulfations of the, 

 auricle preceeded thofe. of the heart r egu-.- 

 l^rly. The heart did not appear to be morel 

 fwelled or redder than in a natural flate,^ 

 and the auricle was not near fo full of blood ; 

 as in Exp. 6. Twelve minutes pafl ten, viz, » 

 fix minutes after this frog was taken out of 

 the folution oi opium, its heart beat 27 times 

 in a minute. At eleven o'clock it perform- 

 ed 18 vibrations in that time j and 16 at a 



quarter 



