. Animal life as affected by the natural conditions of existence. Animal ecology. 214 THE IKFLOENCE OF INANIMATE SUBKOUNDl^'GS. is, I'elatively speaking, of cousiderable thickness, very tenacious, and perfectly impeimeable by water; and there can be no doubt that, merely by its resistance to the action of -water, it serves to protect the calcareous inner portion of the shell against its solvent and destriictive effects. Indeed, this is j)roved by the subjoined sketches of one or two shells, of which the calcareous layers have been deeply eaten into, while the organic cuticle hangs about the sh
. Animal life as affected by the natural conditions of existence. Animal ecology. 214 THE IKFLOENCE OF INANIMATE SUBKOUNDl^'GS. is, I'elatively speaking, of cousiderable thickness, very tenacious, and perfectly impeimeable by water; and there can be no doubt that, merely by its resistance to the action of -water, it serves to protect the calcareous inner portion of the shell against its solvent and destriictive effects. Indeed, this is j)roved by the subjoined sketches of one or two shells, of which the calcareous layers have been deeply eaten into, while the organic cuticle hangs about the shell in thin rags, as it were, above the holes or pits (fig. 63). The question now is: How did erosion first begin in these cases ? For, though it would be perfectly intelligible that the face of the calcareous layer, when once laid bare, should be easily eaten into by the action of the. 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 Semper, C. (Carl), 1832-1893. New York, D. Appleton
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Keywords: ., bookcentury1800, bookdecade1880, bookpublishernewyo, bookyear1881
