. Biology and human life. Biology. Fig. 195. Mechanical protection of seeds I, bitternut (Hicoria minima), of the walnut family; 2, chestnut oak {Quercus prinus)', 3, sweet gum {Liquidambar styracifliia), of the witch-hazel family; 4, table-mountain pine (Pinus pungens). 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 Gruenberg, Benjamin C. (Benjamin Charles), 1875-1965. Boston, New York [etc. ] Ginn and Company

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Keywords: ., bookcentury1900, bookdecade1920, bookpublishe, booksubjectbiology