conifers. SILVA OF NORTH AMERICA. 109 



inconspicuous bands of small summer cells, numerous large prominent resin passages, and many thin 

 medullary rays. The specific gravity of the absolutely dry wood is 0.3499, a cubic foot weighing 21.81 

 pounds. 



Pinus attenuata was discovered in 1847 by Karl Theodor Hartweg, 1 about twenty miles north of 

 Monterey on the Santa Cruz Mountains, and was introduced by him into European plantations in which 

 it is still occasionally cultivated, although as an ornamental plant it has little to recommend it. 



1 See ii. 34. 



