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Ôtsuki Gentaku was a ''[[Rangaku]]'' scholar.

Ôtsuki Gentaku was a ''[[Rangaku]]'' scholar.

His [[1799]] ''Ransetsu benwaku'' (蘭説弁惑, "Clarifying Errors in Theories about the Dutch") was perhaps the first major Japanese work to assert that Africans were "no different from the rest of mankind," and that they were not, on the whole, as a group, less intelligent or otherwise of inherently lower birth, but rather that Africans, like anyone else, included "the noble and the lowly, ... the wise and the foolish."<ref>Gary Leupp, ''Interracial Intimacy in Japan: Western Men and Japanese Women, 1543-1900'', A&C Black (2003), 94.</ref>

His [[1799]] ''Ransetsu benwaku'' (蘭説弁惑, "Clarifying Errors in Theories about the Dutch") was perhaps the first major Japanese work to assert that Africans were "no different from the rest of mankind," and that they were not, on the whole, as a group, less intelligent or otherwise of inherently lower birth, but rather that Africans, like anyone else, included "the noble and the lowly, ... the wise and the foolish." This text was also among those which challenged the prevailing notion that dark skin came from extended contact with the water (and that blacks were particularly adept at swimming), suggesting instead that their dark skin derived from their hot, southerly climate, and from lengthy exposure to the sun.<ref>Gary Leupp, ''Interracial Intimacy in Japan: Western Men and Japanese Women, 1543-1900'', A&C Black (2003), 94.</ref>

Along with [[Shimura Hiroyuki]], Ôtsuki produced in [[1807]] a set of interviews called ''[[Kankai ibun]]'', which recorded the experiences of a group of Japanese castaways who had seen the Atlantic, the Straits of Magellan, and [[Hawaii]].<ref>Mitani Hiroshi, David Noble (trans.), ''Escape from Impasse'', International House of Japan (2006), 27.</ref>

Along with [[Shimura Hiroyuki]], Ôtsuki produced in [[1807]] a set of interviews called ''[[Kankai ibun]]'', which recorded the experiences of a group of Japanese castaways who had seen the Atlantic, the Straits of Magellan, and [[Hawaii]].<ref>Mitani Hiroshi, David Noble (trans.), ''Escape from Impasse'', International House of Japan (2006), 27.</ref>