12 



Table 8 gives heights for Flathead and Missoula counties, Mont., 

 classified in types. The basis for the smaller diameters is not suf- 

 ficient to warrant the drawing of definite conclusions. The mixed 

 slope type has poorest height growth. Douglas fir enters the mixture 

 strongly on the west and south slopes, and that indicates a rather 

 dry soil. Quality classes would seem to be a better method of clas- 

 sification. In this case the pure slope and mixed flat types might be 

 thrown together as Quality I, pure flat as Quality II, and mixed 

 slope as Quality III. 



Table 8. — Height for various types in Flathead and Missoula counties, Mont. 



Diameter, 

 breast- 

 high. 



Mixed slope. 



Pure flat. 



Pure slope. 



Mixed flat. 



Height. 



Basis. 



Height. 



Basis. 



Height. 



Basis. 



Height. 



Basis. 



Inches. 

 2 



Feet. 



Trees. 



Feet. 



Trees. 



Feet. 



Trees. 



Feet. 



17 

 31 

 44 

 56 

 66 

 74 



87 

 92 

 97 

 101 

 105 

 108 

 112 

 115 

 118 

 120 

 122 

 124 

 128 



Trees. 

 2 

 16 

 23 

 19 

 13 

 18 

 26 

 24 

 25 

 28 

 24 

 19 

 20 

 14 

 13 

 17 

 6 

 7 

 2 

 1 



4.... 







24 



33 



43 



53 



63 



72 



80 



87 



93 



98 



102 



108 



110 



113 



1 



3 



4 



5 



6 



13 



32 



30 



26 



14 



9 



8 



5 



3 





G 



32 



41 



50 



57 



G4 



70 



75 



80 



. 85 



89 



93 



97 



101 



105 



1 



8 



2 



8 



16 



21 



20 



19 



8 



13 



6 

 2 

 3 



44 



54 



63 



70 



77 



83 



88 



92 



95 



99 



102 



104 



107 



109 



110 



1 



11 



8 



14 



35 



41 



31 



25 



17 



12 



13 



10 



4 



5 



8 



10. 



12. 



^a 



16. 



18.... 



20 



22 



24. 



28 



28.. 



30.... 



32 



34 







36. 











38 



40 











i 















- 



Total. 





134, 





159 





234 





317 

















CLEAE LENGTH. 



Table 9 contains average " clear lengths" for yellow pine in Flat- 

 head and Missoula counties, Mont., Prescott National Forest, and 

 the Black Hills National Forest. The first two are very similar. 

 The Black Hills pine has a considerably larger clear length, due 

 partly to its greater age, partly to other influences. 



The interpretation of "clear length" by different field men will 

 always cause confusion when results are to be compared; to some 

 it will mean the length of trunk absolutely free from branches, to 

 others it will mean the length free from living branches; to others 

 still, the length to the first branch 2 inches in diameter, living or dead. 

 The interpretation should be, that part of the tree which will furnish 

 almost entirely clear lumber. This would allow an occasional small 

 knot that might be eliminated without appreciable waste in cutting 

 into logs or in sawing at the mill. The judgment of the measurer 

 must always be exercised to some extent. 



[Cir. 127] 



