Arizona republican., 1920-11-04

upon, and therefore. to be sure Of re- production the few seedlings which become established every two or three years must be conserved. The heavy seed crop on the Colorado plateau in 1918 followed by the extremely wet year Of 1919 gave promise Of recurrence of Natures feat g years ago. when large areas became fully stocked as a result of a single seed crop; but the dry summer Of 1920 has already taken heavy toll from the splendid seeding crop of 1919. and therefore the outcome still hangs in the balance.
 It has required nearly 12 years to establish these facts and others per taining to reproduction of western vel low pine. Administrative details re- main to be worked out, but the scien tific aspects of the problem are now in the final stages of solution. Failure to solve this problem would mean that on extensive areas numbering would cease with the removal of the present stand and that eventually the lusaber industry in the southwest would be greatly curtailed; but the infonElafion brought to light by this invesliralion assures a perpetual utilization Of 5he vast pine forests of Arizona and New Mexico without danger of exhaustion.
 In the space here allotted 1t has been possible only to sketch in a bf4ef way the work accomplished Readers who desire further information are referred to the following publications which may be obtained, as far as the supply is available, by applying to the Fort Valley experiment station, Flagstaff, Ariz.
 Reproduction of Western Yellow Pine in the Southwest" c. A. Pearson, Forest Service Circular 1T4, 1910. The Influence of Age and Condition of the Tree Upon Seed Production in Western Yellow Pine" c. A Pearson, Forest Service Circular 196, 1912.
 The Composite Type on the Apache National Forest" Harold II. Greena myre, Forest Service Bulletin 125, 1913.
 Forest Planting in Arizona and New l Mexico" c. 4. Pearson. Proceedings Society American Foresters, Vol. TX. No 4. 1914.
 "The Role of Aspen in the Reforesta | tion of Mountain Burns in Arizona an l New Mexico" G. A. Pearson, the Plant World. Vol. r. No. g, 1914. "A Meteorological Study of Parks and Timbered Areas in the Western Yellow Pine Forests of Arizona and ] New Mexico" c. A. Pearson, Monthly Weather Review. Vol il, pp 1615-162S 1914.
 "The Influence of a Western Yellow Pine Forest on the Accumulation and Melting of Snow" Alexander T. Jae- nicIe and Max H. Foerster, Monthly l Weather Review, Vol. 4s, March. 1915.
 'The Use of Frustum Form Factors in Constructing Volume Tables for 1 Western Yellow Pine in the South west" Clarence F. Korstian, Proceed ings Society American Foresters. Vol x, No. 8. 1915.
 'rHewn Tie, Versus Saw Timber Ro- tations in Forest Management Clar- ence F. Korsttan. Proceedings Society American Foresters, Vol. EI, No. 3, 1916
 Studies of Yield and Reproduction of Western Yellow Pine in Arizona and New Mexico" c. A. Pearson, Journal of Forestry, March. 1918.
 The Relation Between Spring Pre- cipitation and Height Growth of West ern Yellow Pine Saplings in Arizona" c. A. Pearson, Journal of Forestrv, October. 1918
 Forthcoming publications will treat in an exhaustive manner the subjects of natural reproduction of western yell low pine, forest planting. and the phys ical requirements of forest trees.
 Fort Valley Experiment Station. c. A. PEAE-oz
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