Ⅰ．THE DIRECT EFFECT OF RADIATION ON PROTEINS,VIRUSES,AND OTHER LARGE MOLECULES＆Ernest C．Pollard 1
Ⅱ．THE IN VITRO EFFECTS OF RADIATIONS ON MOLECULES OF BIOLOGICAL IMPORTANCE＆E．S．G．Barron 30
Ⅲ．CELLULAR BIOCHEMISTRY＆Frederick G．Sherman 54
Ⅳ．ENZYME AND RELATED EFFECTS IN THE INTACT CELL＆Kenneth P．DuBois 86
Ⅴ．CHANGES IN NUCLEIC ACID METABOLISM AS A RESULT OF RADIATION＆Charles E．Carter 119