1937 年 8 巻 5 号 p. 661-667,57
Dr. Nagai in Keiaien described a comparison of alopecia leprosa in Aiseien and Keiaien in this journal. In this work he discussed the number and grade of alopecia in three groups of patients from three different districts, Hondo (Kyushu), Oshima and Okinawa. And his conclusion was that the higher is the temperature in the district, the fewer is the number of alopecia and the lighter is its grade. These facts coincide exactly with the observation of leprosy made by Dr. Hayashi in a tour through the world, that in the tropic zone alopecia leprosa is relative scarcely found. Dr. Nagai, therefore, could certify Hayashi's theory on the relationship of leprosy and climate. The author also certified these facts from the ophthalmological point of view. The following tables may be reliable for the explanation of the facts.
Table 1. During Hayashis tour he got an exact number of leprous blind in various leper houses in the world. This number was compared with a statistic in leproseries in Japan. The number of blind in Rakusei-in in Formosa is nearly same with that in the tropic zone.
Table 2. The patients of Keiaien were classified into three groups according to their native places, as done by Dr. Nagai. Table 7 and 8 show the temperature and latitude of these three districts. On the table 2 the leprous eye symptoms of C type in three districts were shown and it is obvious that the higher is the climate the slighter is the eye symptom. Among various symptoms keratitis leprosa is most available for comparison. This change was classified into three grades.
Table 3 shows more plainly the grade of the keratitis is lighter in warmer district. This phenomen is parallel to general leprous symptoms as seen in table 5 and 6. Same fact is demonstrable in N type as shown in table 7 and 8. It could be supposed that the patients from Oshima and Okinawa might be cases of an earlier stage than those from Hondo. But the table 9 A and B reveals that this is of no propriety. Namely, table 9 A shows the average duration from the beginning of the disease, and B also the average duration from the appearance of C type-efflorescence in these three groups. The curves of the duration are slightly ascending parallel to the ascension of the temperature, contrarily tote eye symptoms, t least, the eye symptoms are slighter in Okinawa patients, though the duration from the onset of leprosy is longer.
This conclusion is sustained by the Hayash is climatic theory, that the warmer is the climate, the slighter is the. leprous symptoms. This also is verified by the fact that in a patient of a certain place of Japan leprous symptoms are slighter in summer than winter, This is the reason why Dr. K. Mitsuda persists in his view to establish leprosorium in the southern part of Japan.