j gO The Lymphocyte and Lymphocytic Tissue 



Leukemia represents in the beginning not a wild, autonomous, purpose- 

 less proliferation but an unsuccessful biologic response, a response that is 

 originally defensive in nature. Why this process eventually becomes autono- 

 mous and lethal remains to be answered. 



Editor's Noil- For documentation the reader is referred to the recent review article: Schwartz, 

 S. O.. and Schoolman, H. M. The etiology of leukemia: The status of the virus as causative agent 

 —A review. Blood 14:279, 1959. 



