. Ecological investigations upon the germination and early growth of forest trees. Trees; Germination; Growth (Plants). Fig. I. The effect of soil depth upon the development f I'liius pon- dcrosa (S. D.). Ten plants grown (i) in deep, (2) in medium, and (3) in shallow soil. V2 natural J* \. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Boerker, Richard H. D. (Richard Hans Douai), b. 1887. Lincoln, Neb

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