2{82 ES^SAYS ANo OBSERVATIONS 



longed. After cutting off its head, a probe 

 puflied into the fpinal marrow, made its fore- 

 legs contrad: feebly. 



3. Eighteen minutes paft four in the 

 afternoon, I inje<fted a ftronger turbid fo-^ 

 lution oil. opium m water than that iifcd in 

 the preceed-ing experiments*, into the fto- 

 mach and guts of a frog ; and as it {quirted 

 out moft of the folution- injected by the ^«wj,' 

 I threw in fome more In its place. At 

 twenty four minutfes paft five, I opened this* 

 frog, and obferved the heart with its auricle, 

 greatly diftended with blood and beating 

 very ilowly, not above feven times in a mi- 

 OUte. When • the heart ' was touched with 

 the point of a pair of fciffars, its motion was- 

 rendered quicker for two or three pulfations : 

 after which it became as flow as before. 

 - 4, Immediately after decollating: a' 

 frog, I deftroyed its fpinal marrow, by 

 pufhing a fmall probe down thro' its fpine, 

 which occafioned flrong convulfions of all 



the 



. * yiz. half an ounce oi opium difiblved in eight ounces of 

 water; which was alfo made ufe of in all the following ex- 

 periments. The heat of the folution was nearly the fame 

 in all the experiments ; viz. about 60 degrees oi Farenheit\ 

 fhcrmomcter. 



