An attempt has been made to review and analyse the Korean population in Japan from the records and data available. In this first part of series of studies, emphasis is laid on fertility. It is more than eighty years since Koreans began to migrate to Japan, and their population reached over two million at the end of the Second World War. The characteristics of the Korean immigration to Japan was its age and sex str ucture, composed mainly of young male adults, it contributed a labor force to meet the Japanese shortage . After the end of the Second World War, the majorty of Koreans returned to their own country, and the 1950 census showed 464, 147 Koreans in Japan.
In an agrarian area of Gunma Prefecture, survey was carried out on the actuality of tuberculocsis examination and on inhabitant's beliefs on this disease in order to seek relation of the beliefs to the receiving or non-receiving or number of the exzamination. The findings are outlined below. 1) As for the reason of receiving the examination, the majority gave a reasonable response that they wanted the early detection of tuberculosis because ti would make trouble if they had this disease. A few (6 .2%), however mentioned a reason which suggested the conservative characteristic of agrarian people, being meticulous over reputation or prestige. 2) As for the motive of receiving the examination, it was noteworthy that they gave the possible curability of tuberculosis . But the respondent did not show any clear relation with the past number of the examination they received. 3) The frequency of the view which regards tuberculosis as incurable and terrible disease did not show any relation with the respondent rate, and can not therefore be considered the critical factor determining the respondency to the examination. 4) On the other hand, the view that the disease takes long time for healing was dominant among those refusing the examination, and can be considered the determinant motive for not receiving the examination. From the above mentioned it can be assumed that lack of correct scientific informations on tuberculosis or lack of the personal and cultural background for such informations may underlie the deep-rooted prejudice against tuberculosis and refusal of examination for this disease. Therefore we want to stress the improvement of health education and orientation of examiness as an imnnrtant rniintPrmaacnre against tuberculosis.
An essential element in discussing the planning of the future medical facility for the treatment of tuberculosis is of course the statistics of tuberculous patients. The plan-ning can be based either on the results of the national survey on tuberculosis or on the prefectural data ; more fundamentally, however, the statistical estimation of the future general population is necessary. The author attempted the estimation of tuberculosis population of this prefecture on the assumption that there will be no significant change in its general population. Since the respondent rate in examination for tuberculosis is extremely high in this prefecture, the result of statistical estimation from the number of the registered tuberculous patients is assumed to have high probability. The results are as follows: 1) It is highly probable that the registered tuberculous patients in Gunma Prefecture in 1975 will be less than 10, 000. 2) The number of the inpatients will be about 700. 3) The number of the patients receiving treatment at home will be about 2, 200, and approximately 7, 000 of the remaining will belong to the category of non-treatment. The following facts can beTproved as constituting the background which accounts for the above estimations : The shift of the patients' ages to the older group, great advance in the social standing, and change in people's beliefs of truberculosis. What is more important in changing the recipients of the treatment is the alteration in the therapeutic principle of the physician and in social milieu surrounding the patients and their families. Especially it has become worldwide tendency to give emphasis on the ambulant treatment for the priority of the patient's individual happiness, since the objective situation which necessitated long hospitalization has now been ameliorated. Consequently, in planning the future facility of medical treatment of tuberculosis, a clinic which is based on the social security system and which includes the geriatric treatment is preferred. This is supported by the fact in the U.S. where the number of sanatoriums for tuberculous patients is said to have fallen to the lowest possible level.