Such was the state of our country as witnessed by Chinese visitors in the first half of the third century A.D. Their observations might not have been very accurate, but they strangely coincide in general with conclusions which could be drawn from Japanese sources. The author of the _San-kuo-chih_, moreover, says that there was a great resemblance in manners and customs between Japan and the island of Hai-nan on the southern coast of China. This assertion may be highly suggestive as to the ethnological study of Japan. An ancient custom of Japan called _kugatachi_, a kind of ordeal to prove one's innocence by dipping a hand into boiling water and taking out some article therefrom unhurt, is said to have been practised by the people of Hai-nan too. To believe hastily, however, in a racial connection between the Japanese and the inhabitants of Hai-nan is a very dangerous matter. Another fact that cannot be overlooked in the Chinese narratives is a passage concerning the continual warfare in Japan, though only a short description of it is given in them. In the preceding chapter I have spoken about the heterogeneity of the Japanese as a race. Among the various racial factors, however, none was able to keep for a long time its racial independence and separateness from the bulk of the Japanese except the Ainu. Other minor factors were lost in the chaotic concourse of races or swallowed up in the midst of the most powerful element. Even the Kumaso, who were once the strongest element in the island of Kyushu, succumbed to the arms of the Japanese not long after the peninsular expedition of the Empress Jingu. The Ainu, too, intermingled with the dominant race wherever circumstances were favourable to such a union. Having been the predecessors of the Japanese, however, in the order of settling in this country, and having moreover been the next most powerful race to it, the Ainu only have been able to retain their racial entity, though continuously decreasing in numbers, up to the present time. In the long history of the antagonism between the Japanese and the Ainu, which covers more than a thousand years, the Ainu were on the whole the losing party, retreating before the Japanese. Surely, however, they must have made a stubborn resistance now and then. That they formerly occupied the island of Kyushu, we know from the archaeological remains. But, from reliable historical records, we cannot know anything certain about the race, until the time when they are to be found fighting against the Japanese in the northern part of Hon-to. Still it is beyond doubt, that there must have been not a few intervening phases, and one of the phases, which is important, coincides with the period when the visit of the Chinese officials took place.