The writer got a chance for the observation of landslides on the mid-stream in the Yoshino river and Iya river, and had some informations. Those informations are summerized as follows.
1) Geology of this area is classified two groups which consist of pelitic schist and psammitic schist. There are many landslides in Pelitic schist area, but there are few in psammitic schist area.
2) Surface water and ground water of pelitic schst area have higher electric conductivity in comparison with psammitic schst area, and heve only a little tendency to alkalinity.
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