Publisher's Synopsis
Excerpt from The Climatic Factor as Illustrated in Arid America
The present volume is an attempt to determine the sequence and character of such variations on the basis of evidence in the drier portions of America from Guatemala on the south to Idaho on the north. A large number of phenomena from the diverse fields of geology, archeology, history, and botany seem to agree in indicating that during the past years North America has been subject to pronounced climatic pulsations similar to those which appear to have taken place in Asia and other parts of the Old World. In the temperate portions of the Eastern Hemisphere the climate of the past appears on the whole to have been distinctly moister than that of the present. The change from the past to the present, however, does not seem to have been gradual and regular, but pulsatory or cyclic, so that certain periods have been exceptionally dry, while others have been wet. In America the same appears to be true.
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