According to Huntington, the climate of California as a whole is less stimulating than is that of Japan, and is, therefore, less satisfactory from the physiological standpoint (8). He bases this belief on the results of his studies which show that wherever the climate has a favorable range of temperature change from day to night, and is characterized by storminess of the cyclonic type, there the people show energy and aggressiveness. Japan, in respect to its storminess ranks as one of the most stimulating regions of the world. It seems remarkable that a very favorable climate, which all would doubtless agree Japan has, should be less favorable to the growth of its children than a less stimulating climate, if there were not another factor at least operating which is less favorable in Japan than in America. That this factor is the diet, there can be little room for doubt, since in several generations a diet of the type there in common use would effect a decrease in the size of animals restricted to it.