Nagasaki during the Tokugawa (1603-1868) was truly Japan's window on the world with its Chinese residences and Deshima island, where Western foreigners, including representatives of the Dutch East India Company, were confined. In 1785 Ōtsuki Gentaku (1757-1827) journeyed from the capital to Nagasaki to meet Dutch physicians and the Japanese who acted as their interpreters. Gentaku was himself a physician, but he was also a Dutch studies (rangaku) scholar who passionately believed that European science and medicine were critical to Japan's progress. Network of Knowledge examines the development of Dutch studies during the crucial years 1770-1830 as Gentaku, with the help of likeminded colleagues, worked to facilitate its growth, creating a school, participating in and hosting scholarly and social gatherings, and circulating books. In time the modest, informal gatherings of Dutch studies devotees (rangakusha), mostly in Edo and Nagasaki, would grow into a pan-national society.