Abstract
Multiple pulse doses of 7,12-dimethylbenz (a) anthracene, under stated conditions, induce leukosis in every rat; in most of the animals leukosis is followed by leukemia which is transplantable to newborn rats of the same strain. Whereas several types of leukemia are evoked, the predominant type is a stem-cell leukemia which has a predilection for growth in liver and is usually associated with erythroblastosis. Presence of thymus and spleen is not obligatory for aromatic induction of this type of leukemia.