2 64 PEN I C I L L I N Ah' D B .4 C T ER I A L s U SC EP TI B I L I T Y -4 S SAY be of variable significance. The problem ofSummary. Irradiation, when used in conleukemogenesis is further complicated by re-junction with methylcholanthrene, failed to su'lts such as those obtained with strain C3H increase the incidence or to accelerate the mice which were susceptible to the induction onset of carcinogen-induced leukemia in of leukemia with estrogens but not with me-strain Dba and strain F mice.thylcholanthrene.s.9
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