Page:Climatic Cycles and Tree-Growth - 1919.djvu/93

From Wikisource
Jump to: navigation, search
This page has been validated.


DOUGLASS   PLATE 8
A Climatic Cycles and Tree-Growth Plate 8A.jpg
B Climatic Cycles and Tree-Growth Plate 8B.jpg

A. Section of Scotch pine from Eberswalde, Prussia, showing solar rhythm.

B. Another section from the same forest, showing same rhythm.