Abstract
Tree-Rings and the Sunspot Cycle.—The researches of Dr. A. E. Douglass on the correlation between the growth-rings in trees and the sunspot cycle have given a probable sunspot curve for many centuries. A Science News Bulletin issued by Science Service, Washington, D.C., dated June 23 announces a further development of his work. He has carried the study of the rings in certain districts back to the date 700 B.C. by examining the timbers in some ancient Indian buildings he was able to give the dates when the trees were cut, and thus to date the buildings. Dr. Antevs, of the University of Stockholm, has found correlation between the structure of clay layers in ancient lake-beds and the sunspot cycle. Both the tree-rings and the clay layers are supposed to depend directly on the rainfall, so it is really the latter that is correlated with the sunspots.
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