ANATOMY, PHYSIOLOGY, &C. 257 



ficient only in colouring matter, and the albumen it 

 contains differs a little from that existing in blood. 

 From this it appears that the albumen is perfected, 

 and the colouring matter formed, in the process of 

 circulation. The saccharine principle of the chyle is 

 then no longer perceptible. 



Bile. 



This secretion is formed in the stomach from ve- 

 nous blood. 



Gastric Juice. 



When there is no secretion of the gastric fluid, as 

 during fevers, people live for weeks without food, 

 one of its uses being to remind us, by its action on 

 the coats of the stomach, that food is necessary. 



There are some substances that remarkably resist 

 the action of the gastric juice, such are the husks of 

 grain, and many seeds, which, if not previously 

 broken by mastication, pass through the stomach 

 and bowels nearly unaltered. On this account birds 

 have a gizzard, and animals that graze have flat 

 teeth which grind and bruise their food. 



The Stomach. 



The stomach is not sensible of the weight, taste, 

 odour, &c. of the substances received, and so far 

 as it is concerned, we could not distinguish sugar 

 from jalap, or wine from medicine. It is, however, 

 the* seat of feelings peculiar to itself, such as hunger, 

 thirst, satiety, squeamishness, &c. 



Conium maculatum, hyocyamus, euphorbium, and 

 hellebore root, are poisons to man ; while the first 

 affords wholesome food to the cow and the hare, the 

 second to the pig, the third to the goat, and the 

 fourth to the quail. 



A quantity of opium or arsenic that would destroy 



