DIGESTION. 31 



4. Assimilable by the blood ; when injected into it, they do not reappear 

 in the urine. 



Gastric juice exerts no influence either upon grape sugar, cane sugar, 

 starch or fat. 



Gastric Digestion occupies on the average from 3 to 5 hours, but 

 varies in duration according to the nature and quantity of the food, 

 exercise, temperature, etc. 



TABLE SHOWING DIGESTIBILITY OF VARIOUS ARTICLES 

 OF FOOD. 



HOURS. MINUTES. 



Eggs, whipped, I 30 



" soft boiled, 3 



" hardboiled, 3 30 



Oysters, raw, 2 55 



" stewed, 3 30 



Lamb, broiled, 2 30 



Veal, broiled, 4 



Pork, roasted, 5 15 



Beefsteak, broiled, 3 



Turkey, roasted, 2 25 



Chicken, boiled, 4 



" fricasseed, 2 45 



Duck, roasted, ,..., 4 



Soup, barley, boiled, I 30 



" bean, " 3 



" chicken, " 3 



" mutton, " 3 30 



Liver, beef, broiled, 2 



Sausage, " 3 20 



Green corn, boiled, 3 45 



Beans, " 2 30 



Potatoes, roasted, 2 30 



" boiled, ,, 3 30 



Cabbage, " 4 30 



Turnips, " 3 30 



Beets " 3 45 



Parsnips, " 2 30 



The Amount of gastric juice secreted in 24 hours varies, under normal 

 conditions, from 8 to 14 pounds. 



Movements of the Stomach. As soon as digestion commences, the 

 cardiac and pyloric orifices are closed ; the walls of the stomach contract 

 upon the food, and a peristaltic action begins, which carries the food along 

 the greater and lesser curvatures, and thoroughly incorporates it with the 



