PHYSICA Luana LITERARY. 333 
-(¢) Wen opium injeted into the 
veins, and thus mixed with the blood, 
leffens or deftroys the fenfibility and mo- 
ving: power of animals much in the fame 
way as when it is applied to their {to- 
mach, guts, or cavity of the abdomen 
(N° 24.); is it mot probable, that it pro- 
duces thefe effets by its action on the ex: 
tremuities of the nerves which terminate 
upon the internal furface of the heart and 
whole vafcular fyftem; and perhaps, alfo, 
by affecting immediately the medulla ce- 
rebriitfelf? And when a folution of opium 
A applied to the bare;abdominal mufcles of 
a frog deprived: of its brain. and fpinal 
marrow, does, after a long time, confide- 
_sably impair the heart’s motion; Is it not 
reafonable to think, that this is owing to 
the finer parts of the opium being ab- 
forbed by the bibulous veins and carried 
to the heart, and thus brought into con- 
tact with the nerves of this organ? No7, 
_ compared with N° 9, 
(f) Since opium, without entering 
the blood or being carried to the feveral 
parts of the body, deftroys the power of 
feeling 
