Bull. U. S. B. F. 1912. 



Plate LXXVI. 



Fig. 50. — Section showing involvement of aortic wall. Tumor alveoH between elastic lamellae of media. X260. 



I 





\i 



V 



I-'k;. 51. — Section showinK infiltnition of individual muscle fibres. Cells within the siircolemma. X5f" 



