SEED PRODUCTION OF WESTERN WHITE PINE. fis 
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, Ceur d’ Alene National Forest (area, 0.9 acre)—Continued. 
TOTAL SEED PRODUCTION. 
Yield from sample trees.| Yield of germinable seed. 
; ? Total sample 
Crown class. Total trees. trees. Cones, |Cleaned Germi- ma Ni 
| seed. | coed 1 plot. : 
| 
No. | Perct.| No. | Perct.| Bush. | Grams.|Grams.| Grams. Grams. No. 
OPE oe aS 3 8 8 1 12} 0.295 | 118.90 | 72.530 | 580. 240 644.711 | 33,929 
PRISER sci cee 8 23 22 | 1 + -215 | 62.77 | 20.715 | 435.015 483. 350 | 31,593 
Les Sete as 15 15 1 6 102 | 38.67 | 14.500 | 159. 500 V77. 222 8,727 
Be eek Gal as 17 17 1 5 008 2.80) |). 2.525 23525 2. 806 137 
Peo cones om 17 il 1 La Phos Serio const neers Rens SS rete a Mee ce I a serena gee cs <8 
Je. Seon 12 12 1 Balciats wanton re Ll ns a Airs 8 cae ee th Ceri |e ro 
i ts Se eee 9 9 1 UG Pe =e eee Neca [estes she ean Ma area eG tat ee aaa an 
Total-o.-. 101 100 7 7 - 620 | 223.14 |110,270 |1,177.280 | 21,308. 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. 
