Abstract
The grade of fullness of rice kernel is appropriately indicated by the specific gravity of the kernel. Among the kinds of rice grains, the rusty or greenish grains are inferior to the normal grains in specific gravity, and milk-white or partly chalky grains are inferior to the rusty or greenish grains but superior to the chalky grains. Moreover, among the normal grains, the grains which are superior in the specific gravity are superior in the lateral diameter, hardness and lustre to the grains which are inferior in specific gravity, and the depth of creases is shallower and the thickness of bran is thinner on the former than on the latter. Therefore, the qualities of rice grains are satisfactorily indicated by the specific gravity and the official standards of grading are indorsed fairly well by the specific gravity.
