In order to observe the physical strength in growing, it is a matter never to be neglected that the physique and also the psychological and intellectual influences must be considered. Nevertheless this sort of study has hitherto been very rare, and leaves much to be discussed. The writer, reflecting this point deeply, investigated the growth and change of the physique under the influence of mental activity, and thus tried to grasp the actual state of the physical development. As an object to be examined, I selected the pupils of a certain primary school in Tokyo and those- of a middle school in its neighbourhood. I made physical examinations for 7 times and practised Awaji-method inspections for the whole pupils at the beginning of each school term from September, 1950 to that in 1952. I selected 413 boys and 405 girls as thorough examined ones through the whole terms, and applied them Rhorer-Index exponent as a physical characterstic. The result and conclusion for these experiments came as follows: For the development of physique during the growth period, psychological factors must play a pretty important part. Above all for lower class boys and girls in the primary school, for the second and third year boys in the middle school, and for the girls in the fifth and sixth year of the primary school and in the first year in the middle school, 2 could admit a reletive importance between the psychological operations and the growth of the physical constitution.
For three monthes since July 1957, the authors have investigated as to peripheral blood picture of healthy adults, (man 55, woman 54) in Toshima village, Tokyo-To and obtained the following results (Figures indicate average values) 1) Number of Erythrocytes were in 424.8×104 in male and 411.9×104 in female and average figure was 418×104 in total. 2) Number of Leucocytes were about 5235 in male, about 5306 in female and total average 5270. These figures were lower than the standard figure of Japanese. 3) Haemoglobin content (by Sahli-Haemochromometer) were 83.7% in male and 21.5% in female and 82.6% in total. 4) The results of differeutial count of Leucocyte were as follows. a) Neutrophil Leucocytes, male 46.5% female 52.1% in total 49.2%. b) Lymphocytes, male 47.9% female 42% in total 45.0% c) As to monocytes, male 2.7% female 2.9% in total 2.8% d) As to eosinophil leucocytes, male 2.9% female 1.7% in total 2.3% e) As to basophil leucocytes, male 0.03% female 0.14% in total 0.09% The authors should pay attention to the lower figure on erythrocytes, leucocytes, and haemogloblin, but they can not tell, without consideration of difference of the life conditions of natives, that these lower figures are significant, therefore they must study further several factors on this matter. As drinking water is rainwater, they have to consider the influence by radioactive materials in future, but at present status they believe it is not necessary to take into consideration the influence of radioactive material from the resultabove mentioned.
Toshima Island, Tokyo, (one of Seven Islands of Izu) is a small island having 413 km2 in area and located at about 140 Kilometers south east of Tokyo City on the Pacific Ocean, and there is Mt. Miyatsuka (507.5 m in high) in the central part of the Island, natural features are very hilly. The auther investigated on Toshima village which is one of the villages of the Island and the result of the investigation on the outline of this village was as follows. According to my investigation on March 1956, the number of house-holds were 83 and the size of population wes 360. Increase and decrease of population were not noted by me. Average temperature of year round is 17.9... Due to not having river and water welling out, villager makes it a rule to stock rain water as their drinking water. Further, due to not having port in this island, the facilities of communication on the sea were always irregular, and also fishing was not easy and degree of cultural life was lower than the other district. As industry, the fruit and oil of camellia were main products and the quantities of these products occupied one third of that of Tokyo-To and it's farm land were occupied 22 per cent of all farm land in this island.
The author investigated on the structure and movement of population at Toshima village, Tokyo-To and obtained the followingr esults. In the construction of population on March 31st 1956, 0.4 age group was 10.8% and 15.19 age group was 5.6%. And rate of construction on age group showed remarkable decrease. Regarding cause of this statues, the former was due to the decrease of birth rate and almost the latter was due to detachment of villagers. Accordingly, percentage of high age group was in high rate. Population and the number of household had change temporarily after and before the End of War II and on 1947, population increased but after that the author could not find out any remarkable change. With regard to population trends birth-rate indicated 25.9 in 1950.1955 and this has recently been decreasing. Death-rate showed 10.4 in average for 9 years after the War II and this figure proves higher than 7.8 for throughout Japan. The rate on stillbirth showed 34.5 and death rate of suckling showed 23.0. Both showed rather too low rate. Marriage rate showed 8.9 and divorcement rate showed 0.5. About cause of death, the author did not find any special question. In case of migration, their destinatio ns were concentrated to City of Tokyo and Oshima-Island.