18 BULLETIN 426, U. S. DEPARTMENT OF AGRICULTURE. 
The ‘‘mill-run”’ value, which is the average of all prices obtained 
for the various grades manufactured, varies with the location of the 
mill and the quality of the timber. The greater the proportion of 
the lower grades produced, the lower is the average mill-run price. 
In. appencale of National Forest stumpage, the average mill-run 
prices of sugar pine shown in Table 11 were ascertained upon the 
basis of selling prices current during 1912. 
TaBLeE 1].— Mill-run values of sugar pine lumber. 
[Price per 1,000 feet.} 
| 
Species. | Species. 
Locality. | Locality. 
Sugar Yellow |; Sugar | Yellow 
pine. pine. pine. pine. 
Siskiyou County..-2-=5-5----- | $21. 00 $19.00 |} Plumas County. .:-.-:...:22-- $23. 00 $19. 00 
Upper Sacramento...........- | 21.00 19.00 || Central San Joaquin.......... 24. 00 20. 00 
Lower Sacramento...........- | 24.10; . 19.80 1) Southern San Joaquin........ | 23.45 | 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, splitting, and breakage 
in handing. 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 Gracious ot species. 
At lumber yards in the hot valley regions of California brown stain 
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 reed from blue 
and brown stain during air seasoning at such a yard. 
Taste 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 | 10/4 | 12/4 | 16/4 | Total. 
1 i 
Percentage oi loss. 
a | | | 
IB iyerstaimens scsi ec ee eee see 19.67 3. 94 Soe SEO) | 2225-2 5 [secs este ceeessee 5. 09 
[BRO NeELStATES o)5e0i 29 a Aun oe 10.7 4.33 | 44.29.| 39.33 | 2 Oba Pe eh A | 35.87 
Blue and brown............-.---.---- 4.44| 5.46] 4.63| 6.06 |...._... pee 1 oe gaa 5.38 
osale Uh faa a ee Gin ee | (3. oe — - aeches cre irs | ara. | ae “46. 34 
| 
Tn cooler mountain yards the loss from blue stain is much greater 
than that indicated in this table, and the loss from brea stain 
much less. Brown stain develops rapidly in kiln drying, and for 
this reason but comparatively little sugar-pine lumber is artificially 
