PLATE LXIV. 



FIG. 140. -Two injected follicles from transverse section of Peyer's patches of small intestine of rabbit. Out 

 of the plexus of large vessels which surrounds the follicle, numerous capillaries are developed, which tend 

 towards the centre of the follicle, and for the most part turn back so as to form loops, p. 125. (Oc 3 

 Obj., 2.) 



FIG. 141. Vertical section of portion of ileum of dog, hardened in chromic acid. a. Villus, showing its 

 cylindrical epithelium with thick basal border. The stroma of the villus seems to consist of closely-packed 

 lymph corpuscles; between are bundles of unstriped muscular fibre. 6. Mucosa with Lieberkuhnian crypts. 

 c. Muscularis mucosce, with interruptions through which the summits of the follicles, d, project, in erder to 

 reach the epithelium of the free surface, d. Portion of tub-muvosa, in which the follicles are closely packed, 

 and are partly fused together, so as to form a Peyer's patch. At the base of the follicles the lymph sinuses, e, 

 which surround them can be seen. /. Portion of circular muscular layer of the mutcularis externa. p. 126. 

 Oc., 3; Obj., 2.) 



