Abstract
In this paper the author investigated the soils of weathered Japanease acid clay in relation to the previovs report. The results obtained indicated the chemical property and the structure of soil colloids as follows : (1) Silica-alumina ratio of colloid(colloid-H_2O) brought to be dispersed in water was greater than that of the whole colloid. Colloid from soil parent material was considered to be of alitic as well as of sialitic properties. (2) From the sedimentation value and also the results of electric microscopic research, colloidal. structure was jelly in parent material (J in Photo 3), soil, in the first layer; gel, in both layers, the second and the third (G in Photo. 2).
