SEED PRODUCTION OF WESTERN WHITE PINE. 



11 



TABLE 4. Classification of trees according to character of crown and presence or absence 

 of cones; number of cones and amount of seed produced by sample trees, and total seed 

 production on plot No. 4, Cceur d'Alene National Forest (area, 0.9 acre) Continued. 



TOTAL SEED PRODUCTION. 



1 Weight of pure seed multiplied by their percentage of germination. 



2 Equivalent to 2.9 pounds. 



CONCLUSIONS. 



The material collected so far is not sufficient to allow of final con- 

 clusions. Those here presented are offered chiefly to point out the 

 still unknown factors into which the problem of seed production 

 resolves itself and of demonstrating the suitability of the proposed 

 method for solving them. 



1. Perhaps the most striking fact brought out by this investiga- 

 tion is that the different crown classes do not participate equally in 

 the production of seed. Thus 98.8 per cent of all the seed in 1911 

 was produced by the first two crown classes, while the third contrib- 

 uted only 1.2 per cent. It is interesting to note that though 1911 

 was a year of a moderately good seed crop, the crown classes IV and V 

 did not bear any seed at all. 



If we divide the average percentage of seed production of each 

 crown class by the average percentage of trees in each class, we 

 secure, roughly, the ratios in which the different crown classes of 

 western white pine bear seed. 



