TTTMDRS. 



305 



Fig. 15S, — Se'.tion uf a L.Mupho >ari*(inia nf a dog's omuiiuini, sliM\;-jim 

 lyniiili ^-iysi.ls anil sarcuniatuus tissLli-, 



sarciiniata. The primary Uimor invijlved the eye-hall and finallv 

 destro}-ed the soft structures uf the entire orhit. In this case 

 two or three metastatic tumors were observed in the li\-er also. 

 The cut on pa.n^x- 299 is a photograph of a Imrse in 

 which there was an extensive sarcomatous fonuatiun in the 

 thoracic cavitv involving the mediastinum, pericardium, [ileura 

 and some smaller nodules in the lung. (The lung nodules were, 

 no doubt, metastatic formations.) Because of their tendency to 

 form metastases and the rapid peripheral infiltration these tu- 

 mors usuallv cause a fatal termination. 



Lympho-sarcomata are a varietv of round-celled sarcoma, and 

 are called Ivmphomata ]tv some authors. Thev arc quite com- 

 mon in all domestic animals. These tumors have their origin 

 in lymphoid tissue and are extended bv the lym])h. Two cases 

 have been studied in the ox: in which the primary lesion was in 

 the wall of the abomasum. One case of generalized lymphosar- 

 comatosis has been observed in a chicken. A pericardial lym- 



