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‘PHYSICAL anv LITERARY. 307 
ArT. XX. 
An Account of fome Experiments made with 
Opium « on living and dying Animals ; by 
RoBERT WuyTT, M. D. F. R. S. 
Fellow “of the Royal College of Phyficians, 
and Profé effor of. Medicine in the Univer fity of 
Edinburgh *. 
HE ancient phyficians imagined 
that opium extinguifhed the fame 
|) of life in animals by its exceflive cold; 
ie 4 and, in later times, there have not been 
wanting thofe who deducéd its effects 
x from a quite oppofite quality, whereby it 
was thought to rarefy the blood and to 
| comprefs the brain or origin of the nerves. 
Thefe falfe notions, however, of the na- 
ture and action of opium, have been re- — 
 futed by feveral of the moderns, whofe 
| writings have thrown confiderable light 
| upon this fubject. 
_ + THE following experiments were made 
| with a view ftill further to illuftrate the 
E oduces its effects, and particularly to. 
a 4 / : fhew 
lee 2 * Avgul 7.1755. 
ov 
manner in which this wonderful drug 
