358 JOURNAL OF FORESTRY 



With regard to fire 



1. Of the fire-burned cuttings studied, the fire was so severe on 

 three of them that it wiped out absolutely all of the reproduction, and 

 on the other two it killed 50 and 90 per cent. 



2. On two of the burned areas the fire killed all the seed trees (two 

 and six per acre, respectively), and on the other three areas, where two 

 or three trees had been left, it killed only a portion of them. 



3. Natural replacement is slowly taking place on all of the areas, 

 but only by slow, incidental seeding from such inferior cull trees as 

 escaped the fire and from trees 10 and 15 chains away on the edges of 

 the burn. Stocking adequate for reforestation is doubtfully present 

 'on three of the burned areas, and two of them, which are 7 and 14 years 

 old, are still practically denuded. 



4. On the timber sale area, where the brush was burned in piles, the 

 lower third or half of the crowns of small bull pines close to the piles 

 had been killed by the heat and flames from big or intensely burning 

 piles. 



It is evident that these findings of the study have the greatest value 

 in determining the best silvicultural method of cutting yellow pine, and 

 many of them have immediate application in present timber sale 

 practice. 



In the case of accelerated growth the important practical value lies 

 in the knowledge that its occurrence produces a yield at the end of the 

 cutting cycle which is greatly in excess of that predicted by the present 

 yield tables. Another point is that accelerated growth is best secured 

 when the reserved trees are evenly distributed, and it is abundantly 

 secured when they make up from 20 to 30 per cent by volume of the 

 original stand — as is the present practice in eastern Oregon. The 

 maximum accelerated growth can be obtained under these conditions 

 if the marker selects for reserved trees only those with thrifty crowns 

 and those which will receive the greatest liberation when their neigh- 

 bors are cut. 



With regard to windfall, it is reassuring to note that the heavy loss 

 is more than offset by the accelerated volume growth. On one repre- 

 sentative acre the increase in volume in the reserved stand was 43 per 

 cent in 20 years, and the heaviest loss through windfall recorded in this 

 study for the same length of time was 22' per cent. The windthrow 

 danger is, nevertheless, exceedingly serious, and that part of the risk 

 which is in the power of the marker to control should receive the most 

 careful attention on his part. Since the study indicates that the bulk of 

 the heavy loss occurs in the first five years, it might be feasible to pro- 



