PLATE 6 



EXPLANATION OF FIGURES 



10 Section through a tumor (180)— adult spleen graft after five days of con- 

 joint growth. The tumor tissue intensely proliferating, but around it a zone is 

 found in which the mesenchymal cells are surrounding the tumor cells forming 

 cellular capsules and digesting them in the so-formed vacuoles. 



11 Large magnification, X 1000, of a small area of figure 10. The tumor cells 

 in the vacuoles are seen in different stages of digestion. 



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