. Bulletin (Pennsylvania Abteilung der Wälder und Gewässer), No. 40-45. Die Wälder und die Forstwirtschaft. Ich "onrrj 'j'. x vivaks ai' tkr Ci' TTinc;. (L'Oratoire ii.) Diese]) Lw P> ircli. . Ich'. assvvdod I'ire Cherry wilden schwarzen C Iierrv lieech lilack Birke Esche Weiß ich fenddck Gestreifte Ahorn. . T<.Tal. Durchschnittlicher Prozentsatz der Uni]) er Durchmesser gesamt Ximdjer von Bäumen (Zoll) der Bäume I'^o 1.4S 45.3. S 2 2,09 19,3 m^1,64 8,4 34 3,68 S.o 32 2,70 7,5 25 3,20 5,9 10 1,60 2,3 6 2,00 1,4 3 3,66 0,7 3 1,00 0,7 2 3,00 0,5. ,.. ,.,. 420? .00 (10.0. Eine sparsame Junge stand von Buche, Birke und Ahorn in Potter County, PA, 15

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. Bulletin (Pennsylvania Department of Forests and Waters), no. 40-45. Forests and forestry. I'onrrj'j'.x vivaks ai'tkr ci'TTinc;. (piot ii.) This ])lw P>ircli . . I'.assvvdod I'ire Cherry Wild Black C Iierrv White Ash lilack Birch lieech I fenddck Striped Maple . . T<.tal . Average Percentage of .uni])er Diameter Total Ximdjer of Trees (inches) of Trees I'^o 1.4S 45.3 .S2 2.09 19.3 M^ 1.64 8.4 34 3.68 s.o 32 2.70 7.5 25 3.20 5.9 10 1.60 2.3 6 2.00 1.4 3 3.66 .7 3 1.00 .7 2 3.00 .5 . , .. ,.,. 420 ?.00 (10.0. A thrifty young stand of Beech, Birch and Maple in Potter county, Pa., fifteen years after chemical wood cutting. TWENTV-TPIRKr: YIvXRS AFTER CUTTING. ( Plot ITI.) This plot is located on a ])lateau characteristic of the region and is surrounded hy about 2,000 acres supi)ortini; the same kind of i^rowth. This area has never been dama|L,a'd by fire, 'i'he orij^inal stands were chieflv hardwoods and were noted for the Tme wild black cherrv which 5 they contained. A chemical wood cutting was made on the.se lands iwenty-tbree years previous to the laying out of the sample plots. The tree growth averaged M) feet in height. The data on this plot are given in the following table: Kind of Trees Hard Maple Wild Black Cherry Yellow Birch .... I'ire Cherry Beech Black Birch Chestnut White Ash Red Oak Cucumber Total . .Xverage Percentage of Number Diameter Total Xumher of Trees (inches) of Trees 164 3. IS 51.9 41 5.47 13.0 2S 2.93 8.9 27 3.85 8.5 22 2.50 7.0 12 2.84 3.8 10 4.20 3.2 9 3.00 2.8 2 7.00 .6 I 4.00 .3 316 3.50 100.0 The advance growth on all the areas studied consists of lire cherry and briars. The valuable species either followed or came in at the same time as the nurse cro]). The former gradually suppressed and killed olT the nurse trees. It was found from observation and from these studies that the older the stands of trees become the higher is the percentage of desirable species in the stand. The stands previously cut clean for chemical or.])aper wood