78 CLIMATIC CYCLES AND TREE-GROWTH. 
In seeking further evidence of sunspot correlation, advantage was 
taken of certain statistics recorded while measuring the various sec- 
tions. Before making the measures or identifying the rings in any way, 
the groups of rings larger than the average were sought out and 
10 
Fie. 26.—Dates of large rings in 80 European trees compared with sunspot curves. 
Ordinates give number of trees in total of 80 showing maxima in respective years. 
if Windsor, Vermont, Group 7110 
L (i) Sections) ne ais 
Same, Smoothed sre: 
10 
0.5 
1650 1700 1710 
1710 1750 1800 1810 
(Sunspot curve] displaced | year to left) 
1710 1750 1300 1610 
1610 1850 1900 __1910 
das 
20 
2 
2.0 
ia al Se Pant tag 
4 TS) Ne 10 
(Sunspot curve | displaced 3 years to left) 
1810 1650 1900 1910 
Fic. 27.—Tree-growth at Windsor, Vermont, showing measures uncorrected; same 
standardized and smoothed, and sunspot numbers displaced 3 years to left. 
