256 ARTHUR WILLIAM MEYER 



which were all as intensely red as the specimens in dog i, also 

 had similar connections. Here then would seem to be two in- 

 stances in which hemolymph nodes were produced experimen- 

 tally. Not in the abdominal cavity, however, but in the thorax 

 instead. But since very reddish nodes found in apparently nor- 

 mal animals, had always been found in connection with the 

 lymphatic system the injection method was resorted to in these 

 two cases also. By means of puncture of the subpleural tissues 

 on the left side some of the fine straight engorged vessels joining 

 the hemorrhagic nodes in dog i were injected. The India ink 

 could plainly be seen displacing the blood in the fine afferent 

 vessels and entering the node. Some of the vessels that were 

 not injected in this way were however injected in a retrograde 

 manner by puncture of the node which they joined. By this 

 means the engorged efferent vessels were also injected and the 

 india ink followed to its entrance into the jugular vein. The 

 node on the right side was treated similarly with identical results 

 and the same results were obtained in dog iii. All the hemor- 

 rhagic nodes and vessels were thus shown to be in direct commu- 

 nication with the large collecting mediastinal Ijonphatic trunks. 

 It is possible, to be sure, that the peculiar condition of the bron- 

 chial lymph nodes was due to splenectomy as some of the earlier 

 investigators believed. Although improbable this is not denied, 

 but that does not prove that they were true hemolymph (hemal) 

 nodes which had been formed from lymph nodes or that they 

 were newly formed nodes. As stated above, congested and hem- 

 orrhagic bronchial and mediastinal lymph nodes are very com- 

 monly found in both dogs and cats. Besides no such nodes 

 were present in dog ii which occupies an intermediate position 

 in time, having been killed forty-one days after operation. 



Haberer (|t,8) in his study on supernumerary spleens also directs 

 attention to the fact that many of the structures reported as 

 accessory spleens probably are not such. He stated that he 

 confused lymph nodes changed by sepsis, with spleens macro- 

 scopically although they were found to be typical lymph glands 

 microscopically. Furthermore, Haberer says that in emaciated 

 individuals he often found specimens which did not look like 



