reaches a larger diameter; in density of stand and in relation of height to diameter it more nearly approaches the development attained in California. There are, however, frequent open stands in the lower and drier foothills where the tree form more nearly resembles that of Arizona.

TABLE 3.-Stand in Flathead and Missoula counties, Mont.

[Altitude, 3,000-4,000 feet.]

TREES 1 INCH AND OVER, BREASTHIGH DIAMETER, ON 13.6 ACRES.

Table 4 shows a stand in eastern Washington that is very similar in composition to the forest in western Montana, though there are fewer trees per acre.

TABLE 4. Stand on the Van Dissel tract, Stevens County, Wash.

[Altitude, 3,000-4,000 feet.]

TREES 2 INCHES AND OVER, BREASTHIGH DIAMETER, ON 20 ACRES.

Table 5 shows a stand of timber on the west slope of the Cas

cades in Klamath County, Oreg.

This shows yellow pine in mixture with sugar pine and white fir. Douglas fir forms a large part of the forest here, but disappears farther south as shown in Table 6. Large diameters, occasionally exceeding 60 inches, are found in all species.

The yield of this stand is estimated as follows:

TABLE 5.-Stand at Pokegama, Klamath County, Oreg.

[Altitude, about 4,000 feet.]

TREES 5 INCHES AND OVER, BREASTHIGH DIAMETER, ON 84 ACRES.

Table 6 shows a stand farther south on the west slope of the Sierras in Madera County, Cal. The same species, except Douglas. fir, are represented here as in Table 5. The diameters run very high, especially of yellow and sugar pine.

Lower down in the foothills of the Sierras there is an open stand of yellow pine which resembles that in Arizona and Colorado.

15318-Cir. 127-08-2

TABLE 6.-Stand at 5,090 feet elevation, Madera County, Cal.

TREES 1 INCH AND OVER, BREASTHIGH DIAMETER, ON 2) ACRES.

Under like climatic conditions the height of a tree is an index of site quality. In Table 7 varying factors, such as density and rainfall, affect the form of the tree, and though yellow pine in the Black Hills has a greater height than in Arizona it is due entirely to a

48

denser stand, for the diameter growth is much less. Evidently this height table can not be used as a comparative index of site quality without constant reference to the diameter growth (Table 12, page 15) and the stand tables for the same regions.

The heights for Stevens County, Wash., were doubtless taken in a maximum stand and are greater than an average for the region. The average height for the region would more nearly approach that given for Montana.

TABLE 7.--Height in several regions.

Diameter. breasthigh.

kota.

Mont.

Cal.

Inches.

1..

Feet. Trees. Fect. Trees. Feet. Trees. Feet. Trees. Feet. Trees. Feet. Trees. 9

23