The author conducted mass examination of blood pressure in summer, autumn and winter, 1958. -1959, on 90% of residents above 20 years of age in an agricultural village in the rice-monoculture belt along the River Abukuma in southern Miyagi, where the death rate for cerebral apoplexy is relatively high, at the same time investigating the area of cultivated faineland the alimentary habit, the housing farility, the intestinal parasitism, the paid amount of local tax, the level of culture and frequency of pregnancy of the subject farming families and members, to study the influence of these factors on the blood-pressure niveau. The results obtained were as follows. 1. The mean systolic pressure was found to rise abruptly in the forties, among both sexes, but the curve of mean diastolic pressure did not show such aconspicuous kink. 2. Both the systolic and the diastolic blood pressure showed low value in summer and high value in winter. 3. The detection rate of hypertension was also low in summer and high in winter. The rate rose with advance in age, reaching 30 around 50 yeas of age. 4. The detection rate of hypotension was high in summer and low in winter. 5. No perceptible correlation could be established between the area of paddy field cultivated by the family and the blood pressure niveau of the members. 6. The relationship between the area of dry field and the blood pressure niveau wa s not definite, either, but it was found that the systolic pressure among females and the diastolic pressure among males in the families with small area of dry farms to cultivate tended to be higher than in those with dry farms of larger area. 7- No definite correlation could be established between the area of cultivated land per head and the blood pressure. 8. No definite correlation was observed between the blood pressure niveau and the consumption of staple food, but the systolic pressure among males alone showed positive correlation with the quantity of consumed miso (Soy-bean poste) soup. 9. The systolic pressure among both sexes was found higher in the subjects showing special liking or dislike to salt-pickled vegetables than in those without such partiality. The diagtolic pressure was found higher in the subjects with special predilection to such pickles, among both sexes, , but among males only, it was found higher in the subject with outspoken distaste for the pickles. 10. The blood prssure in general was higher in the subjects with preference for salty taste, than in the subjects liking sugary foods. The systolic pressure was lower in males with liking for sugary taste than in those with liking for pungent flavor, and in females with liking pungent dishes thaii in those preferring salty foods. The diastolic pressure was lower in males with predilection for sugary foods than in those preferring pungent flavor. 11. The systolic pressure among both sexes and the diastolic pressure among males alone was higher in sake-drinking subjects than among the non-drinkers. 12. Both the systolic and the diastolic pressure was lower in light smokers consuming less than 10 cigarettes daily than in the total non-smokers and the systolic pressure alone was lower in these light smokers than in the heavier smokers consuming more than 11 cigarettes a day, among - males. The relation between blood pressure and smoking was not definitely observable among females. 13. The systolic pressure among females alone was found negatively correlated with the presence of ceiling board in the bed-room. 14. Parasitism by hook-worms alone was fouud positively correlated with both the systolic and the diastolic pressure among females only. parasitism by round-worms in the intestine was not correlated with the blood pressure in any case. 15. Both the systolic as well as the diastolic pressure was found higher in high-spini. ted than in low-spirited subjects among males and vice versa among females.
Statistical investigations were made on the birth weight of 14, 801 babies which were born in Namie Area in Fukushima prefecture during the period 1952 to 1957. The birth weight were analysed in accordance with such factors that the monthly vatiation, seasanal variation, influence of birth order and mothers age. The occurrence rate of premature birth was 6.6 percent (male 5.8, femal 7.5) of the total number of live births. The mean value of birth weight of male was greater than that of femal. It was suggested that the limit of premature infant in femal must be lower than the in case of male. The occurence rate of birth in January was the highest and the lowest in December. The frequency of premature infant was the highest in the first born and the lowest in mother's age 25 to 29
Statistical investigations were made on relations between the infant mortality and the social biological factors as a previous paper. The infant death rate was 44.3 (male 48.6, femal 39.9), the neonatal death rate was 22.4 (male 24.5, femal 20.3). The neonatal death rate of premature infant was ten times higher than that of mature infant. The death rate fo premature infant was 194.1 and existed obvious difference between in case of male and in case of female. The death rate of premature infant was the lowest in the third born and in the mother's age from 25 to 29.
In this paper, statistical investigations were made on the relations between the cause of infant death and the social, biological factors as report 1. The effect of coldness for neonatal death rate was distinguished but the coldness. The death rate of antenatal deformity and diseases peculiar to early infancy was found to be ten times higher in case of premature infant than in case of mature infant. The neonatal death rate in case of premature delivery was thirteenth times higher than in case of mature delivery. The frequency of antenatal defomity and diseases peculiar to early infancy was the highest in the fifth born, the highest in the mother's age of above 40 age.
We examined on parasite infestation 8101 pupils of 14 elementary and 9 junior high schools at Miyako-Island in Ryukyu. About 60% of pupils of these schools underwent our examination. These 23 schools were divided into 3 groups such as urban are, rural area, and fishing villages. It was found that the incidence of ascaris infection among the pupils lived at fishing villages was the highest (32.6%), and that the incidence of the ancylostomiasis among the pupils in rural area was the highest (25.3%), especially the hookworn incidence of the pupils of rural janior high school showed very high. About the enterobiasis, there is no differrnce among these 3 groups.