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Most serious students would not give this book more than the few glances necessary to discover that its main purpose is to demonstrate the following line of argument: Human physiology and psychology are affected by the weather; the weather is affected by sun spots; therefore, economic crises are as inevitable as the periodicity of sun spots; hence, mankind must stop trying to eliminate economic crises and wars and learn to live with them.
However, the investigation of man's relation to daily and seasonal changes in weather has been so neglected that this book has a greater importance than would be indicated by its unreliable methods, its great unevenness in quality of reporting and reliability of observations and its fatalistic, passive approach. It contains many references to earlier investigations, mostly of a statistical nature. There is also included a report of an investigation of a set of triplets by Dr. Petersen