316 



Diseases of Fuultry 



to determine th 

 more or less al 

 through the tis 

 fixed tissues so 

 tumor cells may 

 ing a lymphatic 

 Probably the 



e point of origin. Certain lymphomata are 

 veolar in structure ; others grow diffusely 

 sues. The tumor may be confined to the 



that it is essentially extravascular, or the 

 also occur in the circulatory blood constitut- 

 leukemia." 



second most frequent type of connective 



Fig. 68. — Sarcoma Chicken Tumor No. I, Second Generation. (After 



Rous.) 



tissue tumor is sarcoma. This may occur as simple sarcoma 

 or it may occur in combination with one or more of the other 

 types. That is, it is a generalized and simple tissue which 

 may represent the complete adult stage of a tumor, as Rous 

 Chicken Tumor No. I, and Chicken Tumor No. XVIII. 

 However, since it is a simple generalized tissue, it may also 

 represent an early stage in the development of one of the 

 other forms of connective tissue tumors. In these cases it 

 remains as a matrix in which the further developed tissues 



