38 JOlKNAIv Ol' I'OKIvSTKV 



fl := Fractional part or percentage of whole area burned over which needs re-r 

 planting. Tliis is placed at 30 per cent. May be varied, of course, for 

 each species or type. 



K = Cost of protection and achninistr.ition \)vr acre per year. Tliis is placed at 

 4 cents. 



From these ai)i)roxinicite data the following table has been computed, 

 the values being rounded off to the nearest half dollar: 



.\vcrage age of stand 

 Species 10 years 20 years 30 years 40 years 



White pine $4.50 $7.00 $10.00 $14.50 



Yellow pine, cedar, spruce 2.50 4.00 6.00 8. 50 



Larch, Douglas I'lr 2.00 3.00 4.00 4.50 



Lodgepole pine i . 00 i . 50 2 . 00 3 . 00 



In applying the table to mixed stands consideration should be given 

 the percentage of species in the mixture and the proportionate values 

 of each species used. The same principle should be used for the value 

 of understocked stands, since the table is based on fully-stocked condi- 

 tions. For protecting forests an arbitrary value per acre for all species 

 is satisfactory. 



In actual practice the data should, of course, be carefully worked out. 

 It has been approximated in this article without a great deal of investi- 

 gation for purposes of illustration. The most difficult premise to secure 

 will no doubt be the fractional part of the burned area necessary to 

 plant. Extensive planting reconnaissance will do much toward clearing 

 up this point. 



It is realized that the method probably will not fit purely local con- 

 ditions, but it is believed for statistical purposes it will approximate 

 very closely the average value of the reproduction destroyed as nearly 

 as can be determined when applied to an entire region. 



