also be traced in the stand, height, and diameter-growth tables. 

 The boundaries of the regions are not always sharply drawn and 

 intermediate stands may occasionally be found that will require nice 

 judgment in the use of the tables. 



STANDS. 



Five tables of stands containing western yellow pine are given. 

 They illustrate the different regions, and give associated species and 

 relative development as seen in the diameters attained. The size of 

 the tree increases from the Black Hills to Arizona, to Colorado, to 

 Montana, to eastern Washington, and finally makes a decided 

 increase to the west slope of the Sierras in California and Oregon. 

 While yellow pine attains its maximum size in the central and north- 

 ern Sierras of California and Oregon in mixture with sugar pine and 

 white fir, on the lower and drier foothills it occurs in pure stands, or 

 with a few scrubby oaks, and has a form very similar to that found in 

 Arizona. 



Table 1 shows the average stand per acre on township 1 south, 

 range 3 east, of the Black Hills National Forest. It shows a large per- 

 centage of " insect-killed " timber, but does not indicate an average 

 loss from that source. The column of totals gives the stand before 

 the invasion of the beetle. It shows a denser stand than is found in 

 many parts of the Black Hills, and gives the possibilities of the region. 

 The stands here are mainly pure, and mostly very open; diameters 

 above 30 inches are infrequent and the greater part of the stand is 

 under 18 inches. 



[Cir. 127] 



