GROWTH IN TREES. 17 
if the wire has been kinked in adjustment, breaks may occur after 
a few days at ordinary tensions. 
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Fic. 3.—One form of the dendrometer. An encircling band of galvanized steel strip is brought 
together at B and rests upon wooden blocks bearing on the bark at F, F, F, F, etc. An encircling 
wire passes through suitable holes in flexible arms attached to the supporting steel strip. This 
wire is anchored to a post on the inner side of the dial, the other end being attached 10 the short 
arm of the indicator at A. The enlargement which has taken place has pressed the flexible arms 
outward, pulling on the wire to such extent as to cause the indicator point to move from zero at 
the bottom of the scale to ‘4.” 
MEASUREMENTS OF PINE TREES. 
The Monterey pine (Pinus radiata) is native to the maritime climate 
of the fog belt of the Monterey peninsula and the slopes of the Santa 
Lucia mountains to the southward; and, as numerous trees of all ages 
were available on the grounds of the Coastal Laboratory at Carmel, it 
was selected for an intensive study of the growth of the pines. 
This tree is characterized by extremely rapid growth, both in length 
and thickness, and does not survive to an age of more than about 80 
years. The staminate and pistillate flowers are matured late in 
January and the pollen is scattered in February. Elongation of the 
