. Ecological investigations upon the germination and early growth of forest trees . Fig. I. The effect of soil texture upon the development of Pinus poii- derosa (S. D.). Ten plants each (i) grown in loam, (2) grown in sand, (3) grown in gravel. ^ natural size. -^..wr r ⢠â 1 2 y'3 .' < ⢠Fig. 2. The effect of soil texture upon the development of Robinia pseu- dacacia. Three plants each (i) grown in loam, (2) grown in sand, (3) in gravel. \'?. natural size.

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Keywords: ., bookcentury1900, bookdecade1910, bookpublisherlincolnneb, booksub