Brain weight and the relation thereof to mental ability had received attention by numerous observers. Japanese contributions to the subject have been made by Taguchi, Suzulri, Nagayo, Kurokawa, Kimura, Yoshizawa, Hara, Hoshi, Kusumoto, and Amano with Hayashi ; and much has gradually been learned through these studies. Concerning the brain weight of the Korean, however, so far as a survey of the available literature shows, there has been only one brief report, based on sixty brains ( 8 56, 0 4) aged from 21 to 74 years, by the late Prof. Takeshi Kubo.
Factors influencing brain weight are essentially the body length and age, but nutritive conditions, social class, and occupation may also be of some import. In addition Nagayo recently called attention to disease as a factor that may have remarkable effect on brain weight ; and Kimura warned that care must be exercised in judging the value of brain weights over 1700 and under 1150 p.
I am able to report the brain weight of 153 Koreans 15 to 78 years of age. Of these, 136 were male brains (15 to 78 years) and 17 female (22 to 57 years). The records are chiefly those of autopsies in the anatomical and pathological laboratories of the Keijyo Medical College, made, since Kubo's report; in which connection I wish to express my thanks to Doctor Muto, professor of pathology of the College, who placed the records and material at my disposal.
The brains, including the medulla oblongata, were removed by the usual dissecting method under uniform conditions, with