Abstract
W. B. Schostakowitsch found 3, 6, 11, 18 and 29 year periods and 2.8, 5.1 and 25.6 day periods in various natural phenomena, for examples, number of sun spot, atmospheric temperature and other meteorological elements, earthquakes, biological phenomena and so on. He attributed these periods to the periodic variation of sun spot. The late Prof. T. Terada has shown that quasiperiodicity of 3-4 days or 3-4 years which is due to the quite at random fluctuation appears in various natural phenomena which have actually no physical periodicty. The present authors doubted whether Schostakowitsch's periods are real or appearent arising from his anslysis. Accordingly, they tried the same method of analysis to two at random series which have no real periodicity and found 3.0, 6.9, 11.4 day or year periods for one series and 2.8, -5.7, 11.6 day or year periods for an other series which are very near his perids. Hence, it is very probable that some or many of Schostakowitsch's periods are rather due to the method of analysis than to the solar activity.
