DIGESTION EXPERIMENTS: 119 



a) Make gastric juice by adding a few drops of glycerole 

 pepsin to 0.2 per cent hydrochloric acid. Prepare digestion 

 test tubes by adding y 2 test tube of solution to small amount 

 each of egg albumin (or fibrin) and starch. 



b) Test results of gastric digestion in a) for peptones by 

 means of biuret test. 



6) Effects of pancreatic juice and bile: 



a) Shake sweet oil with an equal amount of solution of 

 pancreatic extract. 



b) Prepare as in a) and add a few drops of bile. Compare 

 with a). Examine a drop under microscope and compare with 

 a drop of milk. 



c) Moisten with bile a filter paper stretched across top of a 

 funnel and add a teaspoonful of oil. Moisten with water 

 another filter paper similarly placed, and apply the same 

 amount of oil. Note comparative rapidity of penetration. 



4) Make soap by boiling fat or oil with a strong solution of 

 caustic soda. Test result by shaking a few drops with water. 



