558 MECHANISM OF SECRETION OF INTESTINAL JUICE. 



cells. It is, therefore, not justifiable to assume that the secreted 

 juice has the same action as an extract of the intestinal mucous 

 membrane. 



That extracts of the intestinal mucous membrane have marked 

 physiological properties, there is little doubt. It is comparatively easy 

 to make such extracts free from micro-organisms, and it is generally 

 agreed that these extracts have a considerable power of inverting cane- 

 sugar and of changing starch, in an intense degree, into dextrose, 

 probably through the stage of maltose. 



