Abstract
The mineral water of the Ogoto spring is originated in its western mountain area, and receives on its way underground water with fluorine ion, etc, which flows down eastwards. A good content of total carbonic acid in this spring may originate from the fault of the western side of Lake Biwa-ko. This mineral water may have no outlet to Lake Biwa-ko, that is, it seems to be reserved between the clay strata. It will be explained that : the secular change of chemical contents of this spring is caused by the permeation of underground water in the high land of a higher hydropressure. The reservoir area of the Ogoto spring seems to be restricted to a narrow zone.
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