Abstract
Year after year, during the period from the late summer to early autumn, there develops a conspicuous turbid layer which is alkaline in some measure in the thermocline of Lake Noziri etc.
On August 26th of 1959, however, its development in the thermocline of Lake Noziri was faint, and, besides, the water in it was almost neutral (pH=7.2). The author considers this phenomenon to be attributed to the circulation, though not perfect, of the lake water caused by the heavy rainfall which had lasted without intermission for about eleven hours immediately before the time of observation.
After the heavy rain, fine weather lasted with high atmospheric temperature ; on September 5th of this year a turbid layer which was markedly alkaline (pH=8.1) was observed in the thermocline of this lake.
