4IO Forestry Quarterly. 



taken on windfalls and other down timber. On these the stick 

 readings checked as closely with the caliper reading as on the 

 standing trees. 



The following table gives the number of trees and total diame- 

 ter inches of each species, and shows the very slight discrepancy 

 between the two instruments by species and for all four species. 



TABLE SHOWING COMPARATIVE MEASUREMENTS OF 975 

 TREES WITH BILTMORE STICK AND CALIPERS. 



Number of Trees Total Diam. In. Total Average 

 Down. Standing. Total. Bilt. Call- Differ- Differ- 

 Species Reg. Irreg. Stick pers ence ence 



Douglas Fir (Pseu- 



dotsuga taxifolia) 26 210 24 260 9481 9520 — 39 — .15 

 Western Red Cedar 



(Thuja plicata) ... 22 112 21 155 2474 2510 — 36 — .23 

 Western Hemlock 



(Tsuga hetero- 



phylla) II 298 49 358 10555 10452 +103 +.28 



Amabilis Fir (Abies 



am-abilis) 194 8 202 5443; 5369 +74 +.31 



Total four species .. 59 814 102 975 27953 27851 +102 +.1 



In 1910 the Forest Service had a small quantity of Biltmore 

 sticks made bearing this scale. During the field season of that 

 year these sticks were used on the Crater, Olympic, Snoqualmie 

 and Umpqua National Forests in intensive reconnaissance work 

 and met with great favor as convenient and practical instruments. 



Tests of the Biltmore stick made on the Crater, Olympic and 

 Umpqua Forests gave the following results: 



Crater National Forest; data furnished by Mr. H. D. Foster. 

 One hundred trees ranging from ten to sixty-four inches in di- 

 ameter were measured with Biltmore stick, calipers and diameter 

 tape. 



Olympic National Forest; data furnished by Mr. W. H. Gib- 

 bons. One hundred and eighty trees ranging from ten to fifty 

 inches in diameter were measured with Biltmore stick and cal- 

 ipers. 



The following table shows the results of these tests, which, to 

 be sure, are not very conclusive owing to the small number of 

 trees measured in each case, but at least indicate the Biltmore 

 stick's practical value as a field instrument. The data secured 

 on the Snoqualmie National Forest is repeated for the purpose of 

 comparison. 



