The Digestive System 179 



lumen. The cells are of the same general character 

 as in the more distal parts of the gland except 

 that they are somewhat more columnar or py- 

 ramidal than in the body of the gland. The nuclei 

 of the body and fundus are usually somewhat larger 

 and more nearly spherical than in the columnar 

 cells of the duct. 



The feeding animals from which tissues were 

 taken were considerably smaller than the hiber- 

 nating specimen, so that the stomach walls were 

 proportionately thinner; but, so far as could be 

 discovered, there was no difference in structure. 



The relative thickness of the entire wall in each 

 of the three regions sectioned was about the same 

 as described above. 



As has been said, the mucosa or the pyloric or 

 small region of the stomach from the hibernating 

 animal was so poorly fixed that its structure could 

 not be made out. In the feeding stage the mucosa 

 of this region was as well fixed as any of the other 

 tissues and showed that its structure is essen- 

 tially like that shown in Figure 46, except that the 

 glands are proportionately not quite so long as 

 in the fundic and cardiac regions, and are 

 somewhat more open — that is, they have wider 

 lumina ; their lining cells are all of one kind and are 

 unchanged from what was seen in the hibernating 

 condition. 



The Small Intestine. Three regions of the small 

 intestine will be described: (i) an anterior, just 



