抄録
1. The River Kôri, which flows along the western foot of Volcano Taradake, in the north-east of Kyûshû, deposits part of its load at its eroded valley end, forming an alluvial fan. The gravels composing this fan affect the aspects of the settlements, the cultivated grounds, etc., on the fan
2. We notice first that most of the houses are surrounded by stone walls. These stones are gravels that were removed from such surfaces of the fan as were cleared for cultivation. This paper deals with these stone walls.
3. Houses with stone walls are more numerous at the apex. than at the foot of the fan, and near the boundaries of rice fields and farms on either side of the fan than in the central part of it. Many such houses are built near the present river course.
4. Where the walls enclose but a small space, only houses are found, but large enclosures contain farms besides.
5. The stone walls are solidly built of roundish gravels without bonding of any sort. Large gravels are used for the outside of the walls, the interior being filled with small ones.
6. On the surface of the fan, there are a few rice-fields, but farms predominate, The reason, for this is that, water cannot be made to stay for any length of time on the surface of the fan as it sinks immediately into the soil.
7. The gravels are dug out from underneath the farms as well as from the river sides and used for railway ballst and other purposes.
8. At present the major part of the surface of the fan is cultivated, , though gravels on the farms are now being removed for their improvement.
