The ABO blood group of 6, 576 inhabitants in CHIISAGATA district are examined, Results are obtained as follows: 1. The frequencies of 0, A, B, and AB are 28. 28%, 36. 12%, 24. 33% and 11. 30% respectively. 2. The frequencies calculated for this district are the same results which are reported on frequencies in NAGANO Prefecture by KOBAYASHI previously. It shows that the frequencies of gene B (q) is much higher in this district and gene O (r) is lower than in total Japanese, 3. The local differences of this district are not so remarkable, but are found that gene A (p) is higher in inhabitants of mountains than in those of lands.
The statistical observation on the familial aggregation in infection of Japanese B-Encephaphalitis, Roundworm and Hookworm Helminthiasis was conducted on the result of complement fixation test of Japanese B-Encephalitis and examination of faeces for the inhabitants in damp rice field area in Toyama Prefecture. It revealed the following facts: 1) In the case of Japanese B-Encephalitis, no significant difference could be found between the actual familial aggregation and that of theoretical solution computed by binominal distribution. It proves that there is no familial aggregation in infection of this disease. From this result, It is considered that the infection of this disease spreads through some common vechicle. 2) But in cases of infection in Roundworm and Hookworm Helminthiasis, significant difference could be found between the actual familial aggregation and the theoretical solution computed by binominal distribution. It proves that there is obviously a familial aggregation in infection of this disease. From this result, it was confirmed that the propagation of this disease is made one by one and from month to month. In the case of Dubini Hookworm Helminthiasis, from the result of epidemiological observation of Hookworm Helminthiasis in this area, it was also confirmed that the important part of the propagation (infection) is made through month despite the previous theory that the major part of the propagation is made through skin.