THE L YMPHA TICS AND L YMPHA TIC GLANDS. 



105 



taining lymphoid cells (a), we discover the sections of blood- 

 vessels (e, f, g) and of glands (d and c). Our attention is 

 then attracted by an oblong cleft (b). It is a lymphatic canal 

 consisting of endothelium. 



Our three drawings, Figs. 100, 101 and 102, contain 



further representations of such 



lymphatic passages. 



The caecal commencements are 



quite perceptible in the first two 



figures. 



Fig. 100. — A colon papilla of the rabbit, 

 in perpendicular section ; a, arterial ; b, 

 venous trunk of the submucous tissue ; 

 c, capillary net-work ; d. descending 

 venous branch ; e, horizontal lymphatic Fig. 101. — Trachoma gland from the conjunctiva of 



(sheathing an artery) ; /, lymph canals of the ox, with injected lymphatics, in vertical section ; 

 the axial portion ; g; their caecal com- a, submucous lymphatic vessel ; c, its distribution to 

 mencements. the passages of the follicle b. 



Thus far all is clear and intelligible. But we now come 

 to an uncertain and much disputed territory. 



Fig. 102. — From the testicle of the calf. Seminiferous canals seen in more oblique, a, and 

 more transverse sections, b ; c, blood-vessels ; d, lymphatics. 



The connective tissue, this substance which is so infinitely 



5* 



