GROWTH IN TREES. 



17 



if the wire has been kinked in adjustment, breaks may occur after 

 a few days at ordinary tensions. 



FIG. 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 pasbes 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 to 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 



