30 Th. Lewis. 



ill the adenoid tissue (pi. II. flg. 13). In other cases a certain amount 

 of the coloured gelatin was seen here and there in the sinuses (pi. II. 

 fig. 13 s), in no case were the sinuses filled with injection, as they 

 are after injecting the arteries. I believe that the small capillaries, 

 alluded to above and seen in pi. I. fig. 5 c.a open from the sinuses and 

 join minute veins; these are joined by other minute veins from the 

 adenoid tissue, which return the blood from the small arteries and 

 capillaries of the same, to form larger veins; these course towards the 

 hilum, always increasing in size as tributaries join them, until, leaving 

 the general lymphoid mass, they are conducted along the finger shaped 

 processes of the adenoid tissue, which they ultimately leave by pierc- 

 ing the capsule. In addition to these veins, others (pi. I. fig. bv) 

 spring directly from the sinuses, having a connection with the sinus 

 similar to the entering arteries. These are protected by valves, which 

 prevent the direct injection of the sinuses by the veins, giving in 

 injected specimens the appearance seen in pi. II. fig. 13. 



The veins from the splenic haemal glands join the splenic vein 

 and ultimately the portal; those draining the blood from the renal 

 group may be traced to the renal veins (pi. I. fig. 7). 



The general structure of the capillaries and small blood, vessels 

 as seen in sections exhibits no extraordinary features. Thome, who 

 worked with certain "Lymphdrüsen" of the monkey, has stated that 

 the endothelium cells lining them are in many cases almost cylindrical, 

 but I have been unable to find this appearance in any gland examined. 

 The cells are flattened or spindle-shaped as in the case of other, 

 capillaries, and are continuous with those lining the sinuses. Thome 

 also believed that phagocytes take origin from these cells. I have 

 not noticed any appearances which could justify me in conflrming 

 him, though it is probable that phagocytes arise from cells directly 

 continuous with these. 



VIII. Nervous supply in the rat and dog. 



The nervous supply to the haemal glands has hitherto received 

 no attention. I have studied it in the rat g,nd dog, particularly in the 

 former, and find the main features identical in both. 



