Rivers in Japan have of late been apt to flood owing to disforestation during war times. Abundant debris accumulate in existing reservoirs, and so the capacity of reservoirs becomes smaller year after year, while the floor of the down-stream is upheaved by accumulation of finer detritus. This condition threaten us with flood and actually the river has diminished in hydro-electric power At present sand-controlling dams are being built everywhere-along the upstream, but this operation is to loose a favourable site of hydro-electric power. (Abstracted by a member of the editorial staff.)
