The Counteraction the Effect of Poisonous water of Tama River in Edo Priod

In the late Edo period, Kouemon Taguchi-a merchant of Akitahan-tried to counteract the effect of poisonous water of Tama River. The objective of this work was increase of agriculture along the river.This work is unique from the points of view, he didn't have knowledge of chemistry and he had no finansial supports.I saw that he had the rational thinking, and he started on this attempt for the purpos of finance.In this study, I evaluated his radical thinking and rational idea. And I show his work was not only Akitahan's need but also his investment.