DIGESTION. 



4. Digestion of protein: action of pepsin. Cubes of coagulated egg albumen 

 were placed on the previous evening in three test-tubes containing respectively : 



(a) Scrapings from the stomach wall of a rabbit in 0-5 per cent HC1 ; 

 (6) Ditto in distilled water ; 

 (c) 0-5 per cent HC1 alone. 



The test-tubes were kept overnight in an incubator at 36. Note the state of the cubes 

 in each tube. 



5. Digestion of protein : action of trypsin. Cubes of coagulated egg albumen 

 were placed on the previous evening in two test-tubes containing respectively : 



(a) Trypsin in 0-2 per cent NaHC0 3 solution ; 

 (6) Ditto boiled. 



The test-tubes were kept overnight in an incubator at 36. Note the state of the cubes 

 in each tube. 



