EXPERIMENTS ON DIGESTION. 
585 
6. A colouring matter. 
7. A matter highly charged with azote, feebly soluble in 
water, insoluble in cold alcohol, but soluble in that which is warm. 
8. An animal matter (gliadine 1) insoluble in cold water, but 
soluble in warm water. 
9. A matter (ozmazome ?) soluble in water and alcohol, and 
precipitated by the tincture of the gall-nut. 
10. A matter which exhales a resinous odour when it is heated. 
11. A matter soluble in water, insoluble in alcohol, and preci- 
pitated by acids (caseous matter, perhaps, with some salivary 
matter?). 
12. Mucus. 
13. Bi-carbonate of ammonia. 
14-20. Margarate, oleate, acetate, cholate, and bicarbonate, 
phosphate and sulphate of soda with a little potash. 
21. Chloruret of sodium. 
22. Phosphate of lime. 
23. Water occasionally to the extent 91.51 per cent. 
The bile of the dog contained the following substances : — 
1. An odoriferous principle. 
2. Choline. 
3. Probably resin, but always in very small quantities. On 
this account it is precipitated in a very minute quantity by the 
acetate of lead. 
4. Picromel. 
5. A considerable quantity of colouring matter. 
6. A substance which is precipitated from a warm alcoholic 
solution, by the act of cooling (gliadine ?). 
7. Some salivary matter, or what is analogous to it. 
8. Some mucus. It appears that the bile contains only a small 
quantity of this- matter in solution, for we find no carbonate of 
soda, or at least a very small quantity. 
9. Probably some margarate and oleate of potash. 
10. Some acetate, phosphate and sulphate of soda, and chloru- 
ret of sodium. 
11. Some phosphate of lime. 
THE ALTERATIONS WHICH THE FOOD UNDERGOES IN THE SMALL 
INTESTINES. 
The aliment, dissolved by the gastric juice, enters the duodenum 
a little and a little at a time, in proportion as it is digested and 
converted into chyme. In all our experiments we have found the 
chyme to redden the tincture of turnsol. It stimulates the walls 
of the duodenum, and determines an abundant flow of bile from 
the gall-bladder, and from the biliary canals. In all the animals 
