6/2/56 Dear Dr. Lederberg-- Those Scandinavians are a real blend! Better look over deveau's Hereditas stuff pretty carefully. The reason I am sending this to excitedly is because re your Baltimore [ . . . ], there is a prophylactic paper re leukemia by [ . . . ] and Levan to see: nucleus fragm. cycle. See my reprint [ . . . ] if you lack. Steve