TUMORS. 



323 



the peripheral portions of the tumor and parts into which it is extending 

 may reveal early phases of proliferation in the- endothelium of lymph 



FIG. 167. EXDOTHELIOMA (ENDOTHELIAL SARCOMA) OF DURA MATER. 



FIG. 168. ENDOTHKLIOMA OK PLEURA. 

 Showing the formation of mucus within the endothelial cell masses ; the mucus is stained with haematoxylin. 



