[The relationship between hemopoiesis and osteogenesis in several species of rodents]

Differentiation of the bone marrow transplants of rats, guinea pigs and dwarf hamsters placed under renal capsule of irradiated mice was studied. Active osteogenesis occurred in the transplants of rats and guinea pigs; as to hemopoiesis-it was irregular in rats and was arrested in guinea pigs. On the contrary, in the transplants of dwarf hamsters an intensive hemopoiesis was maintained and osteogenic capacity of the stroma was poor. It is supposed that the bone tissue in some rodent species was not a prerequisite for normal maintenance of myeloid hemopoiesis, while in others-primary bone stroma formation was necessary for the subsequent functioning of hemopoietic tissue.