The aim was to study secular changes in head dimensions of Japanese adults. The age range of the subjects was between 18 and 25 years. Four head measurements were taken: head length, head breadth, head height and head circumference. The present sample was compared with the series taken between 1910 and 1917 of Matsumura (1925) for both sexes, the one measured in 1965 of Morita and Ohtsuki (1973) for male and another measured in 1975-1979 of Ohtsuki and Ito (1980) for female. The present study demonstrated the presence of larger means for head length, head breadth and cephalic index in the...