DIGESTION 



261 



does not in itself lead to peristalsis, but exaggerates 

 greatly the sensitiveness of the bowel to other stimuli. 



Antiperistalsis has not been clearly proved to occur 

 in the small intestine experimentally, although it has 

 been observed to take place in a case of intestinal 



FIG. 18. AVERAGE TIME AT WHICH VARIOUS POINTS OP THE 

 COLON ARE REACHED AFTER A BlSMUTH BREAKFAST TAKEN 

 AT 8 A.M. (HERTZ.) 



fistula in man.* It may, perhaps, occur in pathological 

 conditions. 



Sensibility of the Intestines. 



The intestine would appear to be insensitive to all 

 ordinary stimuli. Intestinal pain arises either from 

 * Busch, Vir chow's Archiv, 1858, xiv. 110. 



