. The doctrine of descent and Darwinism. Evolution. AMPHIBIANS. 209 Amphibians needs no elucidation. Their predecessors were water-breathers, whose form and mode of Hfe are more faithfully preserved by the long-tailed Amphibians, the tritons, and salamanders, than by the frogs. In our tritons, sexual maturity not rarely commences in the larval state, hence in a phase which was definitive in the progenitors of the present genera. There is, in- deed, one species, the Mexican Axolotl, which normally propagates itself during the larval phase. Auguste Dumeril's observation is highly interesting, th
. The doctrine of descent and Darwinism. Evolution. AMPHIBIANS. 209 Amphibians needs no elucidation. Their predecessors were water-breathers, whose form and mode of Hfe are more faithfully preserved by the long-tailed Amphibians, the tritons, and salamanders, than by the frogs. In our tritons, sexual maturity not rarely commences in the larval state, hence in a phase which was definitive in the progenitors of the present genera. There is, in- deed, one species, the Mexican Axolotl, which normally propagates itself during the larval phase. Auguste Dumeril's observation is highly interesting, that of the ^^3c^i i0m /. PIG. 18.—Amblystoma. thousands of Axolotls that he bred at Paris, some few advanced beyond the grade of development hitherto known in them, i. e. they lost their gills, changed the shape of their bodies not inconsiderably, and from gill-. 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 Schmidt, Dr. (Eduard Oskar), 1823-1886. New York, Appleton
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