In order to investigate concretely the population phenomena of a rural community from medical, social and economical viewpoints, the authoress undercook a synthetic investigation of the population phenomena in Sakuokaraura, Tsukuba-gun, Ibaraki Prefecture. The results are as follows: 1. In Sakuoka village, the grain farming has principally been taken up, and the raising of silkworm, tobacco-plants and vegetables are subsidiaries. 2. In view of an actual status of food, clothing and habitation of the villagers, and their sanitary conditions, the authoress feels that there is growing certain consciousness of the new mode of living, while there still survive some deep-rooted traditional obstacles in their social life. 3. The authoress considers that, the medical means of the social and economical foundation must be adopted to improve the sanitary conditions to such a farm village life as this. 4. The authoress concluded that maintenance of the present living standard might depend on the change of population in this village, whether there occurs some economical improvement or not.
The postual blood pressure reflex was investigated on 155 children of the normal classes and 60 of the sickly children classes; 1st, 2nd and 3rd grades of the Momonoi Primary School in Maebashi City. Change in blood pressure accompanying change in posture was classified into five types: A, B, C, D and E. The “prolonged type” was observed more frequently in sickly children classes than the normal. Blood pressure changes on posture alteration from the sitting to the lying and the reverse proved more unstable in children of the sickly children class. For children of normal classes, a positive correlation was observed between the time for blood pressure fall on the change from the lying to the sitting posture and the time for the recovery of the blood pressure. Such correlation was not observed for children of the sickly children class, The “fatigue type” was also found oftener for sickly children classes than the normal, especialy for the 1st year children (P<0.05), justifing the arrangement and maintenance of the sickly children class.