18 



BULLETIJSr 426, U. S. DEPARTMENT OF AGEICULTTJEE. 



The "mill-run" value, which is the average of all prices obtained 

 for the various gi-ades manufactured, varies with the location of the 

 mill and the quahty of the timber. The greater the proportion of 

 the lower grades produced, the lower is the average mill-run price. 

 In appraisals of National Forest stumpage, the average mill-run 

 prices of sugar pine shown in Table 11 were ascertained upon the 

 basis of selhng prices current during 1912. 



Table 11. — Mill-run values of sugar pine lumber. 

 [Price per 1,000 feet.] 





Species. 



Locality. 



Specie.s. 



Locality. 



1 

 Sugar Yellow 

 pine. pine. 



Sugar 

 pine. 



Yellow 

 pine. 



Siskiyou County 



S21.00 819.00 

 21. 00 19. 00 

 24. 10 1 19. SO 



1 



Pluxnas Countv 



S23. 00 

 24.00 

 23.45 



S19. 00 



Upper Sacramento 



Lower Sacramento 



Central San Joaquin 



20.00 



Southern San Joaquin 



19.65 



DEPRECIATION OF SUGAR-PINE LUMBER DURING AIR SEASONING. 



In the summer of 1914, the Forest Service carried on a study to 

 determine the depreciation in grade of pine lumber during air 

 seasoning. Depreciation during seasoning by this method is caused 

 by checks, blue stain, brown stain, warping, sphtting, and breakage 

 in handhng. The heaviest depreciation occurs in high-grade lumber 

 (No. 2 shop and better). The amount of loss is determined largely 

 by climatic conditions, method of piling, location of pile, length of 

 ime in pile, and characteristics of species. 



At lumber yards in the hot valley regions of California brown statin 

 seems to cause one-third of the depreciation in grade. 



Table 12 shows the percentage of the total loss in grade in rough 

 sugar-pine lumber, No. 2 shop and better, which resulted from blue 

 and brown stain during air seasoning at such a yard. 



Table 12. — Percentage of total loss in grade in rough sugar-pine lumber. 





Thickness in quarter inches. 





Defect. 



4:4 



5/4 6/4 8/4 



i 

 10/4 12;'4 



16/4 



Total. 





Percentage of loss. 





Blue stain 



19. 67 

 10.70 



4.44 



3.94 

 4.33 

 5.46 



3.35 

 44.29. 

 4.63 



3.56 

 39.33 

 6.06 







5.09 



Brown s.tfiiTi 



2.01 



.. 



35 87 



Blue and brown 



1 



5.38 











Total 















46.34 











i 







In cooler moujitain yards the loss from blue stain is much greater 

 than that indicated in this table, and the loss from brown stain 

 much less. Brown stain develops rapidly in kiln drying, and for 

 this reason but comparatively little sugar-pine lumber is artificially 



