166 ANALYTIC SECT. XIX, 
effected. ‘The beef, however, had no unpleasant 
smell, which shows that the gastric juice is more 
antiseptic than saliva. The gastric juice obtained 
by swallowing sponge, or exciting vomiting, can 
never be pure, for the stomach is always lubri- 
cated with mucus and saliva, which must mingle 
with the gastric fluid procured by either of these 
methods; besides nausea is always attended with 
a copious discharge from the fauces and salivary 
glands. These sources of adulterating the gastrie 
juice, readily explain the discordance of experi- 
ments on artificial digestion. The only way to 
get gastric juice fit for experiments, is to kill an 
animal that has been without food and drink for 
twelve hours. These precautions being taken, we 
never obtained above two drachms from one dog. 
cccevil. 4th. An incision was made in the 
thigh of a dog, separating the cellular membrane 
from the muscles, and a slice of boiled mutton 
put into the wound, which was then closed with 
a stitch. The wound was examined at the expi- 
ration of thirteen hours; its edges had united by 
the first intention, so that we were obliged to 
employ the scalpel to get out the mutton, which 
was found partly decomposed. and partly fibrous. 
ceccviul. 5th. On extracting the mutton, an- 
other slice was introduced into the same wound, 
with the intention of allowing it to remain 
twenty-four hours; but at the end of seven hours, 
‘ 
