1. ALEXANDER, H. E., and LEWY, G. J. exp. Med. , 1947 , 85 , 329 .
2. ANDERSON, E. H. Proc . nat. Acad. Sci. , Wash. , 1944 , 30 , 397 ; LuRIA, S. E., and DELBRECK, M. Genetics, 1943, 28,491; LUCIA, S. E. Genetics, 1945, 30, 84.
3. W;Physiol. Rev.,1945
4. BENHAM , R. S. Science , 1947 , 105 , 69 .
5. CHANDLER, C. A., and SCHOENBACE, E. B. Proc . Soc. exp. Biol. Med. , 1947 , 64 , 208 .