"In the first or second century B. C. a new culture, which also came from the Asiatic continent, began to spread from western Japan. It is known by the name Yayoi, since the first sample; of its pottery were found at Yayoi-ch" in Tokyo. The bearers of the new civilization were the ancestors of the modern Japanese. It is clear that they were an agricultural people, who practiced the wet method of rice cultivation used in southern China. When they arrived they already knew how to cast bronze, and they soon learned also how to forge iron. Metal tools increased their production, and metal weapons gave them a military advantage over the earlier inhabitants, whom they gradually drove back northward or made subjects. Yayoi society was composed of small communities, each organized around a particular clan. As time went on, there emerged great patriarchal families more powerful than the rest. These fought among themselves until eventually the one that occupied the fertile and populous Yamato Plain, near modern Kyoto, succeeded in gaining at least nominal authority over the others. This eventually became the Japanese imperial family, but it should be observed that the concept of an emperor was a comparatively late innovation from China and not really an integral part of Yayoi culture. Yayoi pottery is technically better than that of the previous age, but less imaginative. It is plain and conventional in shape, and its surface designs are simple and linear. It appears to have been turned on the wheel by professional potters and produced in comparatively large quantities."