日本人男子の睾丸中の第一成熱分裂の中期の染色体を多数の材料によつて観察した結果, 3種の異型染色体を発見した. その各々の形態を説明し, 且つこれらの異型染色体のもつ細胞遺伝学的及び人類学的意表に就いて説明した. 本論文は昭和29年12月24日に開催された東京形態学談話会で述べた内容の主要点をまとめたものであつて, 既に一聯の英文論文として印刷中の「日本民族の細胞置伝学的研究」中の三編とほゞ内容を等しくし, こゝに掲載する写真等にも重複しているものがある. 本研究はABCCと順天堂大学の支持によつて行われたものであつて, 筆者は, 本大学学長有山登博士, 解剖学教授椿宏治博士, 東京大学医学部解剖学教授小川鼎三博士, その他多数の諸氏に深甚の感謝を捧げるものである.

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Clinical observations on Type-B Japanese encephalitit in 1953 were carrid out at Manji hospital in Yokohama. The epidemic in this year was comparatively mild falling between the violent epidemic cycles which occur every other years. Of 35 suspected cases (from thirtieth July to eleventhOctober) 27 were positvely diagnosed, the number of the true cases corresponding only to one-third of the previous year. Generally, the courses of encephalitis in this year were rather mild, and there was no case with maniac symptoms. Serum complement-fixation tests were negative in 25% of the cases. Of 27cases, 6 died, the mortality being 22%. Almost all of those with extreme disturbance of consciousness and of those with high fever over 41°C died. In the cases where muscular spasms were frequent and those with long continued low fever were observed to manifest sequela.

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In the studies of diagnosis of pneumoconiosis, 533 cases inhalating mineral dust in high and low concentrations were examined. The distribution of the nodular shadows due to pneumoconiosis was studied by comparing the International Standard of Radiological Classification of Pneumoconiosis, adopted in the third International Conference of Pneumoconiosis, with Oka's classification which we had previously used. Even in the earliest stage the nodular shadows were seen in the outer one-third of the lung field in most of the cases. For this reason it is believed that further study is required befor the degree of pneumoconiosis can be determined chiefly by the distribution areas of the nodular shadows. Furthermore, the size of the nodular shadows, in the cases of low concentration-inhalation was not proportional to the number of working years under mineral dust. The number of the shadws, but not the size, increased in a greater part of the cases, and the progress to the end of the “first degree” was comparatively rapid, few reaching the “second degree”. However, the rapidity of the development of the disease was observed to be influenced by individual differences. The pleural adhesions were mostly noticed in those with tuberculous findings. Bleb-formation of emphysema was seen in the comparatively early stages. The size of the destinction-shadows due to pneumoconiosis in the hilum lymph nodes were mostly two or three centimeters.

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New photographic apparatus were devised, The first was the illuminating device for photography of the outer eye and inner eye, the second, an apparatus for biomicroscopic stereophotography, the third, a hand-fundus-camera. By using these equipments it has become possible to record accurately and simply the various parts from the outer eye, the inner eye to the fundus by photography. It is believed that they have a very high practical value if adopted Clinically.

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