Abstract
Differentiation, de-differentia t ion and re-differentiation of the bone marrow elements including the blood cells and yellow marrow of oviparous animals (chick embryos, chicken and adult fowls) and mammals (rabbit, goats, dogs, cats and guinea-pigs) under well fed and starved conditions were studied by means of examination on the imprinting, sections and culture of the bone marrow. The results obtained are summarized as follows.
(A) Differentiation from blood cells into the bone marrow elements under normal conditions.
