Page:Climatic Cycles and Tree-Growth - 1919.djvu/97
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.
Fig. 24.—Three European groups, standardized and smoothed.
Fig. 25.—Comparison between 57 north Europe trees (smoothed) and sunspot numbers. The trees are from England, Norway, Sweden, and north Germany.