Page:Climatic Cycles and Tree-Growth - 1919.djvu/97

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77
CORRELATION WITH SUNSPOTS.

which neither allowed himself to regard as conclusive. In the immense work of Hellmann (1906) upon the rainfall of the North German drainage area, it is this inconspicuous maximum which he finds the more important of the two.

Climatic Cycles and Tree-Growth Fig 24.jpg

Fig. 24.—Three European groups, standardized and smoothed.

Climatic Cycles and Tree-Growth Fig 25.jpg

Fig. 25.—Comparison between 57 north Europe trees (smoothed) and sunspot numbers. The trees are from England, Norway, Sweden, and north Germany.