﻿44 BULLETIN 24, U. S. DEPARTMENT OF AGRICULTURE. 



inches in diameter, such as could usually be obtained from well- 

 stocked stands of this age. The following figures are believed to be 

 representative of such stands: 



Per cent. 



Boxboards 5 



Firsts and seconds 18 



No. 1 common 30 



No. 2 common 47 



Prices for various grades Avill, of course, vary with the locality, 

 season, or year. The following prices, which were fairly typical for 

 the different grades f. o. b. at the mill during the fall of 1912, are 

 used as a basis to determine the relative log values for the several 

 instances cited : 



Per thousand. 



Boxboards $44 



-Firsts and seconds 27 



No. 1 common 21 



No. 2 common 16 



No. 3 common 12 



Using these figures, the actual mill-run values per thousand feet 

 for the instances cited are given in Table 9. 



Table 9. — Value of logs of different grades based on actual mill run. 



Age. 



Range of 

 logs, di- 

 ameter in- 

 side bark. 



Mill-run 

 values per 

 1,000 feet. 



Stumpage. 



Years. 

 35 

 4G 

 90 



Inches. 

 14-24 

 14-30 

 24-48 



$20. 88 

 21.96 

 26.35 



$5.00 

 6.08 

 10.47 



Assuming that logging and milling costs are the same for the three 

 ages cited, it appears that stumpage values will be apt to increase, a 

 little more than $1 per thousand between the ages of 35 and 46 years. 

 By comparing the stumpage values given on page 42 it is evident 

 that one can not afford to hold the timber, since the cost increases 

 four times more than the stumpage value. The time for cutting 

 cottonwood stands established to-day must eventually be determined 

 on the basis of future market conditions. From the present indica- 

 tions, however, a maximum of 35 years will be necessary for cotton- 

 wood grown for saw timber in natural unthinned stands. In stands 

 established artificially the same yields can probably be obtained in 

 much shorter time, for the regular spacing in such stands enables the 

 young trees to attain in four or five years the dimensions of six or 

 eight year old trees in dense natural thickets. Where thinnings are 



