208 ACTION OF PANCREATIC JUICE. 



1. Emulsifying effects of Pancreatic Juice. 



Chop a pig's pancreas fine, and just cover with water. 

 A'fter two or three hours strain off the water. Take half a 

 test tubeful of this extract, and add half its volume of olive- 

 oil. Shake them thoroughly together. This will form a 

 creamy mixture, an Emulsion. 



Shake oil and water together in a test tube. They soon 

 separate. Now add a little white of egg and shake again. 

 A more permanent emulsion is formed. 



2. The action of the Pancreatic Juice on starch. 



Prepare starch paste as before. Add amylopsin now in- 

 stead of saliva, and keep in a warm place, about the temper- 

 ature of the blood or somewhat warmer. 



Add hydrochloric acid and sodium bicarbonate as in the 

 above experiment. 



Test the result as in the case of saliva. It will be easier 

 to use the amylopsin than to prepare the extract of pancreas 

 for one's own use, as there are excellent preparations in the 

 market. 



3. The action of the Pancreatic Juice on Proteids. 



Take . some hard-boiled white of egg and chop fine, or rub 

 through a sieve. Put some of this into two test tubes ; half 

 fill with water; add pancreatin. To one add a little dilute 

 hydrochloric acid, and to the other a little sodium bicarbon- 

 ate. Set both in a warm place and shake frequently. The 

 effect of temperature may be tested as before. If pancreatin 

 is not at hand, make a glycerin extract of pancreas as fol- 

 lows : " Obtain a fresh pig's pancreas. Lay aside in a cool 

 place twenty-four hours. Mince, and extract for two days in 

 twice its bulk of glycerin. Strain off the glycerin extract. 

 Dilute the glycerin extract with ten times its bulk of water." 



Put into this some hard-boiled white of egg, and keep in 

 a warm place. To one test tube add a little dilute hydro- 



