THE L YMPHA TICS AND L YMPHA TIC GLANDS. \ \ \ 



is true, still lined with the familiar endothelium in the cortex. 

 In the medullary substance the latter cells are absent. The 

 vas efferens, with its independent parietes, is again formed 

 towards the hilus by the conjunction of the medullary canals. 

 The formation of the vas efferens is not easy to examine, as 

 I, the discoverer of this condition, know from former studies. 

 Fig. 104,/,^, k, represents this current. 



Under natural conditions, there are also lying in the cav- 

 ernous passages of our organ, numerous lymphoid cells. 



Whence come the latter ? They have simply, we remark, 

 emigrated actively and passively through the narrow-meshed, 

 reticular surfaces of the follicles and lymphatic tubes. We 

 thus comprehend that a vas afferens may present merely a 

 few lymphoid cells, while the vas efferens may subsequently 

 appear relatively rich in these cellular elements. 



I do not need to remark that the current of fluid through 

 the lymphatic gland can only be determined by the aid of 

 troublesome artificial injections, as His and I can affirm. My 

 studies were, at that time, the first. 



