1) As the boundary of the outgrowth zone of the bone
marrow culture is sharply defined from the surrounding area
and the cellular density becomes very high in leukemia, diagnosis can be made with ease and certainty. 2) The differential diagnosis between aleukemic leukemia and aplastic anemia becomes easy by application of the tissue
cuIture method. 3) The vital observation of blood cells were used in classification of leukemia by cellular systems, and it was discovered that there were a lot of patients with monocytic leukemia and relatively many with acute lymphatic leukemia. 4) Because the cellular growth in the bone marrow culture of aplastic anemia declines extremely and abundant fat cells are observed, the diagnosis of this disease is easily made by employment
of this method.</p
