DIGESTION OP POOD. 



307 



formation of indol, etc., occur in pancreatic digestion, both 

 within and without the body, they are to be regarded as acci- 

 dental, for by proper precautions digestion may be carried on 





ff,ae> 



3\ 



1-0 



% 



'% 



t^- 



-^ \W- 



Fig. 349. — Micro-opganisms of large intestine (after Landois). 1, bacterium coli com- 

 mnne; 2, bacterium lactis aSrogenes; 3, 4, large bacilli of Bienstock, with partial 

 endogenouB Bpore-formation; 5, various stages of development of bacillus which 

 causes fermentation of albumen. 



in the laboratory without their occurrence, and they vary in 

 degree with the animal, the individual, the food, and other con- 

 ditions. It is not, however, to be inferred that micro-organisms 

 serve no useful purpose in the alimentary canal ; the subject, 

 in fact, requires further investigation. 



Succns Entericus.— The difQculties of collecting the secre- 

 tions of lieberkuhn's, Briinner's, and other intestinal glands will 

 be at once apparent. But by dividing the intestine in two 

 places, so as to isolate a loop of the gut, joining the sundered 



PiQ. 250.— Portion of one of Brflnner's glands (Chanveau). 



ends by ligatures, thus making the continuity of the main gut 

 as complete as before, closing one end of the isolated loop, and 



