FERMENTATION 193 



much meat and bread not wholly softened. The 

 softening is greater in the portal region and in 

 those portions of the food next the mucous- mem- 

 brane than in the middle of the stomach contents. 

 The mucus secreted by the gastric mucous 

 membrane is very abundant and is strongly acid. 

 The stomach contents have a sour odor." 1 



Artificial Gastric Juice. 2 1. Strip the mucous 

 membrane from the fourth stomach of a calf. 

 Wash the membrane with cold water until the 

 acid reaction disappears. Dry the mucous mem- 

 brane in the air. Divide some of the dried 

 membrane into small pieces and add dilute hy- 

 drochloric acid. 3 



2. Strip the mucous membrane of the pig or 

 rabbit from the deeper layers of the stomach, cut 

 the mucous membrane into the smallest pieces, 

 wash slightly with water, pour off the water with 

 all possible care, and cover the slightly moist 

 residue with glycerine. 4 Before using, add dilute 

 hydrochloric acid. 



1 Eberle : Physiologie der Verdauung, 1834, p. 100. 



2 Eberle : loc. cit, p. 79. 



8 Dilute hydrochloric acid. Add to 10 c.c. officinal HC1, 

 sp. gr. 1.124 (about 25 per cent HC1), enough water to make 

 1000 c.c. This solution will contain about 0.281 per cent HC1. 

 (Salkowski's Practicum, 1893, p. 130.) 



* Von Wittich : Archiv fur die gesammte Physiologie, 1869, 

 ii, p. 194. 



lo 



