THE group of islands forming Japan may be said to have routes of communication with the continent of Asia at six places: two in the north; two in the southwest, and two in the south. The principal connexion in the north is across the narrow strait of Soya from the northwest point of Yezo to Saghalien and thence to the Amur region of Manchuria. The secondary connexion is from the north-east point of Yezo via the long chain of the Kuriles to Kamchatka. The first of the southwestern routes is from the northwest of Kyushu via the islands of Iki and Tsushima to the southeast of Korea; and the second is from the south of the Izumo promontory in Japan, by the aid of the current which sets up the two southern routes. One of these is from the southwest of Kyushu via the Goto Islands to southeastern China; the other is from the south of Kyushu via the Ryukyu Islands, Formosa, and the Philippines to Malaysia and Polynesia. It has also been proved geologically* that the islands now forming Japan must at one time have been a part of the Asiatic continent. Evidently these various avenues may have given access to immigrants from Siberia, from China, from Malaysia, and from Polynesia. *There have been found in the gravel Tertiary mammals including elephas primigenius, elephas Namadicus, stegodon Clifti, and unnamed varieties of bear, deer, bison, ox, horse, rhinoceros, and whale. (Outlines of the Geology of Japan; Imperial Geological Survey). CULTURE Archaeological research indicates the existence of two distinct cultures in Japan together with traces of a third. One of these cultures has left its relics chiefly in shell-heaps or embedded in the soil, while the remains of another are found mainly in sepulchral chambers or in caves. The relics themselves are palpably distinct except when they show transitional approach to each other. The older culture is attested by more than four thousand residential sites and shell-heaps. Its most distinctive features are the absence of all metallic objects and the presence of pottery not turned on the wheel. Polished, finely chipped, and roughly hewn implements and weapons of stone are found, as are implements of bone and horn. It was, in short, a neolithic culture. The vestiges of the other culture do not include weapons of stone. There are imitations of sheath-knives, swords, and arrow-heads, and there are some models of stone articles. But the alien features are iron weapons and hard pottery always moulded on the wheel. Copper is present mainly in connexion with the work of the goldsmith and the silversmith, and arrow-heads, jingle-bells, mirrors, etc., are also present. The former culture is identified as that of the aboriginal inhabitants, the Yemishi; the latter belongs to the Yamato race, or Japanese proper. Finally, "there are indications that a bronze culture intervened in the south between the stone and the iron phases."* *Munro's Prehistoric Japan. PRIMITIVE CULTURE