EXPERIMENTS IN DIGESTION. 223 
quantity, it was to be detected not only in the pancreatic juice of 
the dog and the sheep, but also in that of the horse. 
It is worthy of remark, that the portion of pancreatic juice 
which ran at the close of the experiment, in the dog and the sheep, 
was slightly alkaline. Did this change depend on the exhaustion 
of nervous influence caused by the experiment 1 
f The residuum, after burning, amounted to 8.28 per cent, of 
dry matter in the dog, and of 29.7 per cent, in the sheep. 
It contained of soluble salts, 
a. Some alkaline carbonate, which doubtless existed in the fluid 
in the state of an acetate. This salt was very abundant in the dog, 
but in small quantity in the sheep. 
b. A great quantity of alkaline chloruret, both in thp dog and 
the sheep. 
c. A small quantity of alkaline phosphate in the dog, and a great 
quantity in the sheep. 
d. A little alkaline sulphate both in the dog and the sheep. 
No alkaline sulpho-cyanuret was found. 
The alkali, both in the dog and in the sheep, consisted of a great 
quantity of soda, with very little potash. 
The salts of the residuum not soluble in water were a little car- 
bonate and phosphate of lime. 
If we compare the composition of the pancreatic juice with that 
of the saliva of the dog or the sheep, we shall find the following 
differences : — 
A. The solid residuum of the saliva does not amount to more 
than half of that of the pancreatic juice. 
B. The saliva contains some mucus, and a peculiar animal mat- 
ter — the animal matter. If there is found any albumen or caseous 
matter in it, it is in very small quantity. On the contrary, the pan- 
creatic juice contains a considerable quantity of albumen and 
caseous matter. We do not find any mucus, and the true salivary 
matter is in very small quantity, if it exists at all. 
C. The saliva is neutral, or contains a very small quantity of 
alkaline carbonate. The pancreatic juice contains a little free 
acid. 
D. The saliva of the sheep contains some alkaline, sulpho-cya- 
nuret. There is not any in the pancreatic juice. 
The other salts are nearly the same. 
It results from this, that the physiologists who believe the pan- 
creatic juice to be identical with the saliva are in error. 
