. Animal life as affected by the natural conditions of existence. Animal ecology. ABSOEPTION OF FOREIGN ELEMENTS. 75 simple vegetables known as Lichens, which, however,, are still generally classed as a distinct group of plants. It may at first sight seem somewhat bold to assume that living plants, even of the simplest conceivable structure, could constantly, or almost constantly, be so associated with an animal as to seem one of its histological elements. But this hypothesis assumes a high degree of probability when we remember that numerous parasites occur with unfailing regularity in certai
. Animal life as affected by the natural conditions of existence. Animal ecology. ABSOEPTION OF FOREIGN ELEMENTS. 75 simple vegetables known as Lichens, which, however,, are still generally classed as a distinct group of plants. It may at first sight seem somewhat bold to assume that living plants, even of the simplest conceivable structure, could constantly, or almost constantly, be so associated with an animal as to seem one of its histological elements. But this hypothesis assumes a high degree of probability when we remember that numerous parasites occur with unfailing regularity in certain organs of every individual, or nearly every individual, of a. Fig. 19.—Longitudinal section of Sphenrpus iStcenstrtipii S. The skin of the creature, ep, which is thinnest above, has agglomerated grains of sand throughout its sub- stance. species—for instance, the larvre of certain Nematodes in the foot of the common snail; when, moreover, we take into considera- tion that different animals, more particularly Sponges and Polyps, frequently take up dead or living foreign bodies and utilise them as normal elements of the tissues (fig. 19). Of course no decisive answer can be arrived at by this method, and only experiment can find one. But it seemed to me to be advisable to state both these possible solutions, and to bring forward those facts which may perhaps soon require us, if. 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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