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- 
susar and of chancnncr starch, in an intense degree, into dextrose, 
probably through the stage of maltose. 
