268 



THE ORGANS OF DIGESTION 



where the cells are more numerous and closely packed 



(Gray). 



FIG. 104 



Duodenal gland. * (Frey.) 

 FIG. 105 



Aggregated lymph nodule (Peyer's patch). (Testut.) 



Peyer's patches are regarded as collections of solitary 

 follicles, seen as oval or rounded patches, placed 



