In this article, China’s dependence on foreign sources for food in the 1920s, during the expansion of modern industrialization in the country, was studied.　In the background is the question as to how China supplied food to the increasing industrial laborers.　Because the grain production in China at that time did not increase despite the increase of industrial laborers, it was assumed that the country had relied on imported grains to cover the demands.　The Statistics of Foreign Trade of Different Chinese Ports with Various Countries, accessible at the library of Peking University, was used to study the food trade at the time in question.　The expansion of import from Western countries through the ports, including Shanghai mainly and others in the central area was observed throughout the period.　Originally it was thought to be for importing industrial materials to support the country’s industrialization, but it became evident that food trade made up a large part of trade expansion.　Wheat, rice, and flour, especially, were the main goods of import.　Australia, as well as the United States and Canada, was the main supplier of wheat;rice was imported mainly from Asian countries, including Hong Kong, British India, and French Indochina.　It can be concluded that China’s modern industrialization in the beginning of the 20th century was partially supported by overseas food supplies.　The historical background also supports today’s economic growth of China and the country’s dependence on foreign food sources.

Two coral samples were collected from large tsunami boulders washed ashore on the Maibahbama and Yoshino beach, southeast and east of Miyako Island, and they were radiocarbon dated.
A Porites sample of Maibahbama yielded an age of 675±22 BP （1,664±33 cal AD）, while another sample collected from Yoshino beach yielded an age of 559±22 BP （1,791±33 cal AD）.
These ages are conformable with ages of past tsunamis originated in the Okinawa trough on 1,667 and in the submarine bottom far off of Ishigaki Island on 1,771, respectively.