抄録
The natural environmental investigations were carried out on the source of Yoshimo river and its basin. At the beginning, the method of natural environmental investigation was simply represented. In this report, in particular, the authors clarify the true character of source of Yoshino River. Moreover, based on the date of chemical analysis about water qualitities of source zone of Yoshino River and natural water in its basin and Shikoku area areshown, and the real condition of water environment in the water system of Yoshino River is discussed.
