82 PHYSIOLOGY FOE THE LABORATOEY. 



Apparatus. Evaporating dish. Test-tubes and rack. Warm 

 water-bath. 



Experiment : 



1. Recall the experiments on fats in food. 



2. Make an emulsion with olive oil, flour, and water. 



3. To 10 c.c. of warm artificial pancreatic juice add 



1 c.c. of olive oil. Shake. 



4. To 10 c.c. of warm pancreatic juice add 1 c.c. of 



melted butter. Shake and allow to stand in 

 the warm water-bath. What is the action 

 of pancreatic juice on fats as far as you can 

 judge from these experiments? Compare with 

 results in B. IV. 



III. THE ACTION OF PANCREATIC JUICE ON PROTEIDS. 



Materials. 15 c.c. of artificial pancreatic juice. A piece of raw 

 lean beef cut in small pieces. 



Apparatus. Test-tube. Warm water-bath. 



Experiment : 



Into 15 c.c. of pancreatic juice drop the small pieces of 

 beef. Place the test-tube in the warm water-bath and 

 watch from time to time. Compare this action with that 

 of the gastric juice. 



IV. THE ACTION OF PANCREATIC JUICE ON MILK. 



Materials. 40 c.c. of milk. 20 c.c. of warm pancreatic juice. 

 30 c.c. of acetic acid, 5 c.c. of hydrochloric acid. 

 Apparatus. Test-tubes. Warm water-bath. 



Experiment : 



1. To 20 c.c. of milk add 5 c.c of hydrochloric acid 

 and shake. What is the precipitate ? Filter 



