- 123 



DIGESTION. 



8. Emulsion of fat : action of bile. Olive oil is shaken up in test tubes (a) with 

 water and (6) with bile from an ox. Note the relative permanence of the emulsions 

 formed. 



9. Absorption of fat : section through the intestinal wall of a frog after a meal 

 of fat to show the re-formation of fat globules inside the cells of the intestinal 

 epithelium. 



