(dubbed "Red-Heads" (kōmōjin)) were restricted considerably. Western books were prohibited, with the exemption of books on nautical and medical matters. Initially, a small group of hereditary Japanese–Dutch translators labored in Nagasaki to smooth communication with the foreigners and transmit bits of Western novelties. The Dutch were requested to give updates of world events and to supply novelties to the shōgun every year on their trips to Edo. Finally, the Dutch factories in Nagasaki, in addition to their official trade work in silk and deer hides, were allowed to engage in some level of "private trade". A small, lucrative market for Western curiosities thus developed, focused on the Nagasaki area. With the establishment of a permanent post for a surgeon at the Dutch trading post Dejima, high-ranking Japanese officials started to ask for treatment in cases when local doctors were of no help. One of the most important surgeons was Caspar Schamberger, who induced a continuing interest in medical books, instruments, pharmaceuticals, treatment methods etc. During the second half of the 17th century high-ranking officials ordered telescopes, clocks, oil paintings, microscopes, spectacles, maps, globes, birds, dogs, donkeys, and other rarities for their personal entertainment and for scientific studies. Liberalization of Western knowledge (1720–) Although most Western books were forbidden from 1640, rules were relaxed under shōgun Tokugawa Yoshimune in 1720, which started an influx of Dutch books and their translations into Japanese. One example is the 1787 publication of Morishima Chūryō’s , recording much knowledge received from the Dutch. The book details a vast array of topics: it includes objects such as microscopes and hot air balloons; discusses Western hospitals and the state of knowledge of illness and disease; outlines techniques for painting and printing with copper plates; it describes the makeup of static electricity generators and large ships; and it relates updated geographical knowledge. Between 1804 and 1829, schools opened throughout the country by the Shogunate (Bakufu) as well as terakoya (temple schools) helped spread the new ideas further. By that time, Dutch emissaries and scientists were allowed much more free access to Japanese society. The German physician Philipp Franz von Siebold, attached to the Dutch delegation, established exchanges with Japanese students. He invited Japanese scientists to show them the marvels of Western science, learning, in return, much about the Japanese and their customs. In 1824, von Siebold began a medical school in the outskirts of Nagasaki. Soon this grew