PLATE 7 



EXPLANATION OF FIGURES 



12 and 13 Tumor cells in mitoses surrounded by mesenchymal capsules in a 

 mixed Ehrlich sarcoma — adult spleen graft. 



14 Tumor (Ehrlich sarcoma) cells surrounded by mesenchymal capsules, 

 some of them still showing normal structure except for their spherical shape. 



15 Gradual changes of the tumor (Ehrlich sarcoma) cells within the mesen- 

 chymal capsules, after four days of growth in a mixed tumor adult spleen graft. 



486 



