no 



TENTH LECTURE. 



strands and reticulum of strands of the medullary substance. 

 These "lymphatic tubes" are again, according to my dem- 

 onstration, attached by similar tenter-fibres (b) to the septa 

 (Figs. 105, /, and 107, £),and 

 also connected together by a 

 connective-tissue cellular net- 

 work. 



Kig. 106. — Lymph tube 

 from a mesenteric gland of 

 the dog : a, capillary vessel ; 

 b, reticular connective tissue, 

 forming the tube. 



Fig. 107.- — From the medullary sub- 

 stance of an inguinal lymphatic gland 

 of the ox ; a, lymph tube with the com- 

 plicated system of vessels ', c, piece of 

 another: d, septa; 6, connecting 

 fibres between the tube and septum. 



The lacuna system between the lymphatic tubes we call 

 the lymphafics of the medullary substance. That this arises 

 from the investment spaces of the follicle is taught by the Fig- 

 ures 104, e, and 105, i, I. 



The blood-vessels attain the interior of the organ, for the 

 most part, from the hilus. The arterial affluent, and venous 

 effluent tubes are contained in isolated lymphatic tubes. In 

 the follicles they form a broad-meshed, rounded, capillary net- 

 work. 



Besides these, other smaller vascular branches, surrounded 

 by tenter-fibres, may enter our organ from the capsule. 



What purpose is served by these spaces or canal -work be- 

 tween the capsule and septum system, on the one hand, and 

 the follicles and lymph tubes on the other ? 



We have already answered this. It is the path of the 

 lymph in the interior of the organ. 



On perforating the capsule, the vasa afferentia lose their 

 walls (Fig. 105, h)\ they become lacunar passages, but are, it 



