■)34 



KADIAIION ltl()I.()(!Y 



irpeati'd tlnily, or 5 days ii week, there was a relatively hifi;h percentafje 

 of eareinomas. When there was only one dose per week, sarcomas pre- 

 domiiiatetl. This dilTerenec obviously cannot be attributed to penetra- 

 tion of the radiation. 



Tablk 14-2. Distribution ok Types of Tumor Induckd by Ultraviolkt 

 Radiation in the Ears of .\lbino Mice (Strain A) 

 (After CJrady H al., H)43.) 



In total, about 95 per cent of the tumors were pure sarcomas or sarcoma 

 mixed with carcinoma. About 25 per cent of the tumors contained car- 

 cinoma, a few of these being pure carcinomas, but for the most part mixed 

 with .sarcoma.^ The sarcomas were predominately spindle-cell types, 

 most of them presumably arising from connective tissue, but some from 

 muscular elements. There were a few hemangiomas, one sebaceous 



* These figures are for tumors of the ear only, the eye and other sites not being 

 included. 



