Researches on the taste-blindness tRo P. T. C. were first taken up by A. L. Fox in 1931, and since then many valuable reports have been published. The author has the pleasure to add here his study. Healthy Japanese of both sexes, 2281 in number, aged from eleven to eighty years, were examined with three test substances-henyl-tho-carbamide, lactose and aspirin. The results obtained are as follows. 1, The percentage frequency of taste-blind persons, including so-called weak-tasters who are supposed to be almost near to taste-blindness, to P. T. C. was 11.09%, lactose 4.82%, and to aspirin 18.8%. 2. In the percentages of tasters to each of these three substances, the sexual difference is statistically not significant 3. No relation between taste-blindness and unbalanced feeding habit has been found.
Considering present state of the anti-cancer combat, especially the absence of effective preventive measures, although much progress has beeen made toward early detection of the neoplasm, it is at present most important to grasp a real figure of cancer incidence. So far the cancer statistics of this country have been derived from mortality data. It is, however, desirable to supplement such statistics with morbidity data. The author, thus motivated, made two kinds of survey on cancer morbidity : (1) Every practitioner in the district of Kawagoe Health Centre was visited by the author, and all cancer patients under the medical care were recorded. (2) Family survey was carried out by way of school children of elementary schools of Kawagoe City, Saitama Prefecture and Toyohashi City, Aichi Prefecture. The first procedure has its merit in supplying an accurate number of incidenre, while it does not reveal the distribution pattern of cancer cases. The investigation via school children is quite simple as against other methods, and fairly reliable as to the data of prevalence, allowing also factor analysis. Also some data may be obtained concerning therapeutic efficacy of certain kinds of treatment. Further more, distribution of the questionnaire and explanation how to fill the form to the children and the parents contribute to dissemination of the knowledge on cancer, an acknowledged social measure against cancer.