CORRELATION WITH SUNSPOTS. 
8 S - 
[3 
x 
Tree Growth in Millimeters 
Ss 
— a 
= 
2 
Pe 
a 
= N va a 
SOE Ga said Ba / MT et RT a 
Sunspot numbers 
20 «30—=«=“‘ |SCS 60 70 60 90 900 10 
Years 
Fiq. 22.—Sunspot numbers and annual rings in spruce tree from south Sweden. 
1850. E 19090 
r 7 
aaah | [ DIV LAMA Bey a 4 
Sweden, LAMP AY 
be | aks 
Bergen, |_ ML | 
Norway. US 
L 4 
England ;- 2 | | 
s va 
Eberswalde | | Ai : | | 7 al 
Prussia. 3 | | | : | aps 
| 
ae dat 
Pere aT de | | 4 
ec} | wan : \ 
som AIM | +: 
N\- 
prem 
1650 1900 
Fig. 23.—Six European groups, standardized and smoothed. 
75 
Mim. 
