Journal of forestry . al species which form dense, almostimpenetrable thickets. On the plot under consideration there wereunder the pines a large number of wild huckleberry bushes. Area of sample plot J4 acre Average age of trees 30 years Range of diameters inches Average diameter inches Range of heights 34 feet—66 feet Average height 50 feet Form factor used based on measurement of one tree. Number of trees per acre 440 Volume per acre ., .4,300 cubic feet Mean annual growth per acre 143 cubic feet This growth compares very favorably with that of a pure stand ofwester
Journal of forestry . al species which form dense, almostimpenetrable thickets. On the plot under consideration there wereunder the pines a large number of wild huckleberry bushes. Area of sample plot J4 acre Average age of trees 30 years Range of diameters inches Average diameter inches Range of heights 34 feet—66 feet Average height 50 feet Form factor used based on measurement of one tree. Number of trees per acre 440 Volume per acre ., .4,300 cubic feet Mean annual growth per acre 143 cubic feet This growth compares very favorably with that of a pure stand ofwestern yellow pine near Meadow Valley on the Plumas NationalForest measured in June, 1920, which at 56 years of age showed amean annual growth of ctfbic feet per year, and is much greaterthan the growth for western yellow pine in even aged stands at 30years (W. K. Gallaher, Forestry Quarterly, Vol. XI, 1913, page 533),which is given as 2,800 cubic feet per acre; a mean annual growth of NOTKS ON TIIK BISHOP PINE 891. Top.—Foliage and cones from a specimen, of bishoppine (Pinus vmricata), Humboldt County, Calif. Bottom.—Thrifty one and four year seedlings ofbishop pine, Luflfenholz Creek, Humboldt County, Calif.,on cut-over land. 893 JOURNAL OF FORESTRY 93 cubic feet. These computations were based on stands of secondgrowth near Nevada City between elevations of 2,000 and 4,500 feetin the optimum region for Pinus ponderosa. The crown classes in the above bishop pine stand were dividedas follows: Crown class Per cent of totaltrees Average ,inches Average height,feet ] 60 Co-dominant 63 50 35 SEED EXTRACTION AND GERMINATION The bishop pine, being of the closed cone group of pines, retainsa large proportion of its seed for several years after maturity. Thefollowing figures are the result of experiments on two lots of bishoppine cones collected in the winter of 1916. The first lot came fromthe large trees at Lufifenholz Creek, Humboldt Count
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