would be very difficult to entertain the idea that the civilisation of northeastern Asia could remain alien to the inhabitants of Japan for so long a time as to cause a wide difference in language, manners and customs, and so on, between the peoples on the two opposite shores of the Sea of Japan. Besides, to suppose that the forefathers of the greater portion of the Japanese people were immigrants from northeastern Asia, is, by itself, nothing but a hypothesis, supported by a few remains only, which can be interpreted in more than one way. To go one step farther, and assume that the ruling class of the Japanese too came over from the continental shore of the Sea of Japan is another matter, too uncertain to be readily accepted. Whatever degree of probability there may be in these assertions, there are certain items in our history to the natural interpretation of which any solution of all the ethnological problems must conform; and among those items the following are the most important. The first to be considered is the style of the Japanese building, especially the style of the Shinto shrines and of the dancing halls frequently attached to them. The architectural style of the ordinary Japanese house has undergone many successive changes during the long course of its history, so that its primitive form is now, to a great extent, lost. For instance, the _tatami_, a thick mat, which covers the floor of a Japanese room and is now one of the most remarkable characteristics of Japanese household fittings, is a comparatively modern invention, only planks having been originally used as the material for flooring. Buddhistic influences too can be traced distinctly in a certain turn of construction copied from China, first in building Buddhistic temples and then widely adopted in building ordinary dwelling-houses. In some essential points, however, there are several traits which cannot be ascribed either to an imitation of any continental style or to the result of a gradual adaptation to the climate. Any one can easily see that the ordinary Japanese house may be good for summer and for southern Japan, but not for winter, especially for the rigid winter of northern Japan. How did such a style come into being? If it had been brought from the northeast of the Asiatic continent by the ancient immigrants from those quarters, it should have been a style more adapted to the rigid climate of northern Japan, than we find it is. On the other hand, if it were an outcome of a natural development on the Japanese soil, it should have been one more adapted to the climate, as suitable for the winter as for the summer. Does it not amount almost to an absurdity, that the Japanese should still be following this ancient style of architecture in building their houses in Manchuria and Saghalen? Why do they cling to it so tenaciously? One would say, perhaps, that the architectural form of the ordinary Japanese house has undergone changes from various causes, so that one cannot