PLATE 8 



EXPLANATION OF FIGURES 



16j' Section through a tumor graft, grown eight days on the allantois conjoint 

 with an adult splenic graft at a wide distance. The tumor tissue is seen intensely 

 infiltrated by granular leucocytes, the tumor cells widely separated, but still 

 occasionally found in mitosis. 



17 Section through a tumor (Ehrlich sarcoma) — embryonic spleen graft six 

 days after conjoint growth. The embryonic splenic tissue has undergone an 

 extensive granuloblastic transformation, the tumor tissue is moderately infiltrat- 

 ed by granular leucocytes. No digestion zone develops between the two tissues. 



488 



