PLATE 3 



EXPLANATION OF FIGURE 



5 Section through a part of adjacent tumor (Ehrlich sarcoma) — adult spleen 

 grafts after six days of conjoint growth. The left side of the figure is occupied 

 by healthy proliferating tumor tissue. The right side of the figure is occupied 

 by the splenic tissue. In the region where the tw^o tissues are in contact numer- 

 ous tumor cells are seen surrounded by mesenchymal cells which form a capsule 

 around them. The tumor cells within the vacuoles appear almost spherical, 

 some of them showing regressive changes. Sp. T., adult splenic tissue; T.c, 

 tumor cells. 



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