A STUDY OF THE REDWOOD. 



23 



HOW THE TABLES WERE MAT)E. 



In the tables which follow, trees 14 inches and over in diameter are 

 assumed to be merchantable. This is done because a 14-inch tree is 

 the smallest that will contain a log which is salable by the Spaulding 

 Rule, and because it is the smallest ti'ee used by the mills. 



The volume tables are based on stem analyses, obtained b\^ measur- 

 ing 450 trees at Crescent City, .50 at Eureka, and .50 at Areata. 



To find the volume per tree in board measure, all the trees analyzed, 

 beginning with those that contained a log 12 feet long and 10 inches in 

 diameter at the small end inside the bark, were scaled, and the results 

 for each diameter plotted in a curve. The table of merchantable volume 

 given here was derived from the curve. It gives the average volume 

 in board feet and the height of each tree for diameters from 14 to 27 

 inches, inclusive. 



Table 4. — Merchantable volume of Redwood timber. 



Diameter 

 breast- 

 liigh. 



Merchant- 

 able 

 volume. 



Total 

 height. 



Diameter 

 breast- 

 high. 



Merchant- 

 able 

 volume. 



Total 

 height. 



Inches. 



Board feet. 



Feet. 



Inches. 



Board Jeet. 



Fcrt. 



14 



52 



69 



21 



186 



88 



15 



C2 



72 



22 



188 



91 



16 



74 



75 



23 



226 



93 



17 



90 



78 



24 



267 



95 



18 



108 



81 



25 



316 



97 



19 



130 



83 



26 



430 



99 



20 



156 



86 



27 



496 



101 



The yield per acre of merchantable timber at Crescent City and 

 Areata is given in the following table (No. 5). The figures were 

 found by multiplying the number of trees per acre in each diameter 

 class, as found in the valuation surve}^ tables, by the figure correspond- 

 ing to that diameter class in the table of merchantable volume. Only 

 Crescent City, Eureka, and Areata showed trees large enough to be 

 scaled on the standard chosen. At Eureka the culling of the forest 

 for piling had left nothing on which to base an estimate of yield per 

 acre. 



