PLATE 4 



EXPLANATION OF FIGURES 



6 Section through adjacent tumor (Ehrlich sarcoma) — adult spleen graft 

 after seven days of conjoint growth. The figure represents the part of the graft 

 not in immediate contact with the adult spleen tissue. A granuloblastic meta- 

 plasia in the entire mesenchyme of the host took place as a result of the splenic 

 graft. The tumor cells are seen separated by heavy strands of mesenchyme and 

 by a large number of 'round cells,' which in this particular case are hemoblasts, 

 granuloblasts, and granulocytes. 



7 Section through a mixed tumor (Ehrlich sarcoma) — adult spleen graft 

 after four days of conjoint growth. Only single tumor cells are found, all of them 

 surrounded by mesenchymal capsules, many of them showing well-pronounced 

 regressive changes. Retouched photographs. X 400. 



480 



