. Animal life as affected by the natural conditions of existence. Animal ecology. P#* FiCr. 26,— CliromatopTiores from the skin of a frog:, copied from Lister, a, wholly con- tracted ; b and c, half relaxed ; d, wholly relaxed ; e, wholly contracted, a capUlary vessel; /, g, h, expanded colom-cells or chromatophores. stages of contraction were made from the chromatophores of living animals, and in fact it is quite easy to repeat these obser- vations on the extended web skin of a frog's foot. These chromatophores are distributed in the skin with a certain regularity ; in this particular, reptil
. Animal life as affected by the natural conditions of existence. Animal ecology. P#* FiCr. 26,— CliromatopTiores from the skin of a frog:, copied from Lister, a, wholly con- tracted ; b and c, half relaxed ; d, wholly relaxed ; e, wholly contracted, a capUlary vessel; /, g, h, expanded colom-cells or chromatophores. stages of contraction were made from the chromatophores of living animals, and in fact it is quite easy to repeat these obser- vations on the extended web skin of a frog's foot. These chromatophores are distributed in the skin with a certain regularity ; in this particular, reptiles, fishes, and amphi- bians show hardly any—or no—difference. They usually occur in the cutis only, but sometimes they penetrate into the epider- mis, as, for instance, was the case in the section of the skin of a common frog, shown in fig. 25; but it is not known whether they then retain or lose their contractility. Sometimes the epidermis-. 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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