Page:Climatic Cycles and Tree-Growth - 1919.djvu/135

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DOUGLASS   PLATE 12

Climatic Cycles and Tree-Growth Plate 12.jpg
DIFFERENTIAL PATTERNS.

a. Sunspot Nos. 1610-1910 at 11.4.
b. 57 European trees, 1830-1910 at 11.4.
c. 80 European trees, 1800-1910 at 11.4.
d. South Sweden, 1830-1910 at 12.0.
e. Vermont group, 1650-1910 at 11.3.
f. Flagstaff group, 500 years at 11.4.
g. Flagstaff group at 23.5 years.
h. Norway, 1740-1910 at 23.8 years.
i. Austria, 1830-1910 at 22.0 years.

j. Norway, N-2, 400 years at 33.0.
k. Vermont, 250 years at 32.5.
l. Sweden, 1740-1910 at 37.0.
m. Sequoia, 1300-250 B.C. at 33.0.
n. Flagstaff, 500 years at 33.0.
o. Sequoia, 3200 years at 101.
p. Flagstaff, 500 years at 120.
q. Standard 5-year period at 5.0 years.
r. 5 to 10 year logarithmic variable period at 8.0.