108 Our Field and Forest Trees 



forests. Besides these there is a government 

 experimental farm at Rosslyn, Virginia, in charge 

 of the Bureau of Plant Industry, where Uncle 

 Sam is finding out how to raise basket-willows for 

 profit. 



Each station puts its best energies to work at 

 the problems which urgently concern Its own dis- 

 trict. In the district which includes Arizona and 

 New Mexico, for instance, the most important 

 questions concern yellow pine, because it is the 

 most reliable and valuable timber tree of that 

 region. 



In District number Two — Colorado and Wyo- 

 ming — lodge-pole pine, Douglas fir, and Engel- 

 mann's spruce form the bulk of the forest. There 

 the question of most Importance is how to per- 

 petuate this type of forest, and foresters seek to 

 know the best and most economical way of col- 

 lecting the cones of these trees, and of extracting, 

 cleaning, and storing their seed. 



European foresters have studied seed too, and 

 some of the knowledge which they have gained is 

 useful to us. But they have had no experience 

 with these evergreens, peculiar to the American 

 continent and precious to its people. 



Some problems of forestry concern the entire 

 land, and these are studied at all the experiment 

 stations simultaneously. Some concern only one 

 section of the country, and these are studied at 

 the station in that section. 



