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, Coeur d'Alene National Forest (area, 0.9 acre) — Continued. 



TOTAL SEED PRODUCTION. 





Total trees. 







Yield from, sample trees. 



Yield of germinable seed. 



Crown class. 



Total sample 

 trees. 



Cones. 



Cleaned 

 seed. 



Germi- 

 nable 

 seed. 1 



Per 

 plot. 



Per acre. 



I 



No'. 

 8 

 23 

 15 

 17 

 17 

 12 

 9 



Per ct. 



8 

 22 

 15 

 17 

 17 

 12 



9 



No. 

 1 

 1 

 1 

 1 

 1 

 1 

 1 



Per ct. 



12 

 4 

 6 

 5 

 5 

 8 



11 



Bush. 



0.295 



.215 



.102 



.008 



Grams. 



US. 90 

 62.77 

 38.67 

 2.80 



Grams. 

 72. 530 

 20. 715 

 14. 500 

 2.525 



Grams. 

 580. 240 

 435. 015 

 159. 500 

 2.525 



Grams. 

 644. 711 

 4S3. 350 

 177. 222 

 2.806 



No. 

 33,929 



II 



31,593 



Ila 



8,727 



Ill 



137 



Ilia 





IV 















V 





























Total 



101 



100 



7 



7 



.620 



223. 14 



110,270 



1,177.2S0 



2 1,308.089 



74,386 



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. 



