266 TRANSACTIONS OF THE hi 
FIG. /£, 
Current annual height growth of western yellow pine 
and Douglas fir saplings and seasonal precipitation from 
1909 to 1919, at Grimes Pass, Idaho: 
a—current annual height growth of western yellow pine. 
b—current annual height growth of Douglas fir. 
c=spring precipitation (April-May). 
d—growing season precipitation (April-September). 
At Missoula, Montana: 
e=current annual height growth of western yellow pine. 
f—current annual height growth of Douglas fir. 
g—spring precipitation (April-May). 
h—growing season precipitation (April-September) - 
(e-h inclusive after Kirkwood.) 
