The species, he said, was apparently subject to strange and long-drawn-out fluctuations of nature, fluctuations which lasted for some twenty thousand years.
The species, he said, was apparently subject to strange and long-drawn-out fluctuations of nature, fluctuations which lasted for some twenty thousand years. All races in all climates seemed to manifest this vast rhythm of the spirit, and to suffer it simultaneously. Its cause was unknown. Though it seemed to be due to an influence affecting the whole planet at once, perhaps it actually radiated from a single starting point, but spread rapidly into all lands. Very recently an advanced scientist had suggested that it might be due to variations in the intensity of “cosmic rays.” Geological evidence had established that such a fluctuation of cosmical radiation did occur, caused perhaps by variations in a neighboring cluster of young stars. It was still doubtful whether the psychological rhythm and the astronomical rhythm coincided, but many facts pointed to the conclusion that when the rays were more violent the human spirit declined.
