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After comparing the Salamanders and the perennibranchiate Urodela with the Tadpoles and the Frogs, and enunciating the law that the more highly any animal is organised the more quickly does it pass through the lower stages, Meckel goes on to say
Uraniidae, coloration of the. Urodela. Urosticte Benjamini, sexual differences in. Use and disuse of parts, effects of; influence of, on the races of man. Uterus, reversion in the; more or less divided, in the human subject; double, in the early progenitors of man. Vaccination, influence of. Vancouver Island, Mr. Sproat on the savages of; natives of, eradication of facial hair by the.
The larva of the Urodela is probably more primitive than the tadpole of the Frogs and Toads, and in the former the legs develop while the external gills are still large, long before the animal leaves the water.
The same species in other parts of North America normally goes through the metamorphosis, like other species of the Urodela.
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