We have taken observations on 28 cases of Panmyelopathia, all of which belonged to inpatients of our dept., statistically and clinically; results were as follows:- There were found no definite co-relations either iu age, sex. or by occupation; except 1 case of chronic X-Ray injury; for conscious symptoms, facial paleness was found almost inevitably, while fever, general languor, and palpitation were discovered to succeed it; as for the bleeding, in main it was wont to appear in the form of gingival bleeding, epistaxis, or ecchymosis; for symptoms that were discovered by others, red-cell sedimentation rate was found to be stimulated, in total cases, and such as lengthened bleeding time, anemic cardiac murmurs, together with changes in the eye ground, was recognizable in most cases. Among the blood figure. number of red cells was seen to be about a million or so in majority of cases; while, figures below 1 million was considered to point at serious prognosis. As to hemoglobin content, in most cases, it occupied 20% or so; in respect to hemoglobin index, most of them indicated a hyperchrom, over the entire process, or in partial process. In most cases, the numher of leucocytes proved to be short of 4000, which was also supposed to keep much co-relation with the prognosis. In view to differentiation of lencocytes, a decrease of grauulocytes, an increase of lymphocytes appeared, and in general, in deceased cases, lymphocytosis was clearly observed. Number of blood platelet were apt to decrease to a certain extent. Number of reticulocytes was seen to be small in majority of cases, but it would seem unreasonable to refer to it for the state of prognosis. Heinz' body proved, in serious cases, a value pretty nigh to 1, 000‰, showing a great difference with that, belonging to another sort of anemic diseases, as well as people in healthy condition. No special phase was foundin the myelogramm; in respective disease, various apperances of hematopoetic functions observed. The disease could generally be divided into following 5 types. I. Type of bloodcell-arrest. II. Type of maturation-arrest III. Type of disturbanced regeneration. IV. Mixed type. V. Panmyelophthisis. By dint of Tissue Culture of bone marrow. it has been supposed that there existed certain factor that inhibited growth of parenchyma of bone marrow directly; moreover, the functions of bone marrow have suffered a marked hindrance; Having examined respiration and glycolysis in bone marrow, it was discovered that with type of blodcell-arrest, it has proved normal; with other typs, proved considerablly low value. Its sideroblastogram proved slightly to shift to the right. Generally in most cases, gastric juice showed certain hypoacidity. Among the circulatory system, no unique quality discovered, while the rise in serum iron value was seen, owing to extreme decrease of hematopoetic function. Amongst urine and cerebrospinal fluid, some anemia-causing substance has been detected. As for sugar metabolism, rate for normal and abnormal stood almost the same; while as for the basal metabolism, there was discovered some abnormality. The function test of autonomic nervous system, also showed much abnormality. As to histological view, a high degree atrophy was discovered in hematopoetic tissue, with a marked bleeding tendency.