The White Pine (Pinus strobus Linnaeus) . ated the height growth of the pine during all its lifetime. TheWhite Pine on site k (JeSersou County, Pa.) was mixed with Hemlock of a small unmerchantablesize. The pine here had started simultaneously with the Hemlock, which stimulated the lieightgrowth of the pine only for a certain period, after which the Hemlock, being overtopped by thel)ine, was out of the struggle and left in the capacity of an underwood. The White Pine ou site i,which merged into site /,-, was with hardwoods, which stimulated the height growth of thepine for the first six
The White Pine (Pinus strobus Linnaeus) . ated the height growth of the pine during all its lifetime. TheWhite Pine on site k (JeSersou County, Pa.) was mixed with Hemlock of a small unmerchantablesize. The pine here had started simultaneously with the Hemlock, which stimulated the lieightgrowth of the pine only for a certain period, after which the Hemlock, being overtopped by thel)ine, was out of the struggle and left in the capacity of an underwood. The White Pine ou site i,which merged into site /,-, was with hardwoods, which stimulated the height growth of thepine for the first sixty years, when the hardwoods reached their maximum height and then with-drew from the competition, leaving the pine to increase the height on its own account. The influence of climate and soil on height growth will further appear from a study of thetables in the Appendix. This influence on height growth is not very great, if we (;on(iiie ouriuipiiry to regions of best development, the dittereuce rarely exceeding from 5 to 10 per cent. MO. 20 40 60 80 /RGE IBO Fm. 3.—Diagram shtiwiiiK lit-ight t^rowtli of White Tine in forest of varyiug c^ in Pennsylvania: Site/, Clearrteld County; eitea Jt and i, Jeflerson (.ounty. Effect of locality xipon height groivth. Comparing the growth in ditterent localities, it appears that the trees from Pennsylvaniastarted at a lower rate than those in all other localities, but after the twentieth to the twenty-fifthyear they surpass all others. If this can be accepted as correct, the deduction of the developmentin early youth from old trees being subject to errors, it may be explained by the fact that thesetrees grew in mixture with Hemlock and were kept back by the shade of their neighbors, but whenthey had outgrown these they felt the stimulus exerted by them. The trees from Maine and Wisconsin, also starting more vigorously than those from Michigan,decline and sink below the Michigan trees between the eightieth and ninetieth year, w
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