CYCLES. 103 
Correlation curves.—Figure 34 is arranged to show certain relations 
of special interest in this connection. At the top was found the mean 
pine and sequoia curves for 490 years averaged on an 11.4-year period. 
Below these the mean 11.4-year period for the last 60-year interval is 
given for each tree. This is required for proper comparison with the 
short interval of climatic records. Next the rainfall and temperature 
observed on the southern California coast are plotted, and last of all the 
inverted sunspot curve for a corresponding period. There appears to 
be a marked relationship between these curves. Even the subordinate 
crest, which sometimes shows in the change from maximum to mini- 
a } 120 
4/0 oi, 
cA HA AR ico 659 NH 110 
al 740.90 to 80 me ay 4H 100 
20 85 A AAI | ot 1727 fe eae OS Ss is es (es 
v \ A IS ee ee te aes ee 
4476 BOR es er fe 
ee A 110 
Si te te te OH | -— 4.00 
ri — 'Z + AY s&s L- 11 90 
10 > hi aN tt SHAH 80 
7 g » ww *T? se - 
7a Aine te er Hr RG 
95 0.90 S hes a ‘a ssf] 4 
? Me f 5 ee ae a : Sd See 7, ae EN Be ae ys Se ee 
90 SS — (te Po tO eet \a- 44 
S 4 . \ ~ 3 eh stl tee: A Oe 
pe er a ag se ED 110 
1533 : / Hy 3 Fa\ pe 8 Gt 
Te ES ool Oy te ae 0 
one aS £ peg UY 
2 WA Year N 3 99) I lcohs ry a, 
7 ‘ | ny 
R 1.20 6 .90)—! ae, — Nt 
N 05, FAX tht] See (7858 ' . ie 
534 A aes ER Ss a aR MIAME Sc) nerds aa: tater lees Ps Cd pa 
to 80S 1 1 te F/T 9490 "0528 ' ' 
160/ s v 3 ‘s iy , 3 a Ce a a ins: dunes Nese: cars — ra — 4 
OO ee eee ai et ‘ 
. Rage Sy ea 
AT. ii La is —— 
95 ak m3 mye 
90, Or XI r ee SH] /.20 
1602 ee . A.et ra 100 
to 65 + S l- pe pe to it an K 
1658 , ° ee. et Ey =H aH 
80+ —|— +- Says s+ —|—H bo c 4 
v Ses ey ac (SN TOUR I 
Oo 2 Se eS we eee + | ET OY ae Pe * 
Years Years 
Fie. 33.—Changes in the 11-year period in 500 years. Solid line, Arizona pine; 
dotted line, sequoia,? 
mum of sunspots, matches the suppressed second crest of temperature 
and the full second crest of rainfall and tree-growth. This would seem 
impossible in the absence of a physical relation between them. 
Double and triple cycles.—The first tabulation of the Arizona pines 
covered a period of only 200 years and included 25 trees. There were a 
few errors of identification in some of these trees, sufficient to flatten 
1The correction for the ring 1580 was made too late for insertion in this figure. The two 
dotted curves between 1420 and 1533, therefore, should be moved one year to the left, while 
the third dotted curve between 1534 and 1601 becomes slightly modified. A slight change in 
the first Arizona curve is required by a correction at 1463 A. D. 
Millimeters (solid lines) 
