. The doctrine of descent and Darwinism. Evolution. 56 THE DOCTRINE OF DESCENT. are utterly destitute of air-sacs, and their lungs, like ours in early infancy, are not full-grown; a crop is com^ pletely wanting; gullet and gizzard are, more or less, merged in a sac, all conditions very transitory in us, and, in most, the nails are awkwardly broad, as with us before breaking the shell ; the bats, which appear the most perfect, are alone able to fly; not the others. And these mammals which, so long after birth, are unable to find their own food, and never rise from the ground, fancy themselves m
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. The doctrine of descent and Darwinism. Evolution. 56 THE DOCTRINE OF DESCENT. are utterly destitute of air-sacs, and their lungs, like ours in early infancy, are not full-grown; a crop is com^ pletely wanting; gullet and gizzard are, more or less, merged in a sac, all conditions very transitory in us, and, in most, the nails are awkwardly broad, as with us before breaking the shell ; the bats, which appear the most perfect, are alone able to fly; not the others. And these mammals which, so long after birth, are unable to find their own food, and never rise from the ground, fancy themselves more highly organised than we ?'". riG- T Fig. 8. Nevertheless, there remains the fact of the parallelism of individual development with the systematic series to which the individual belongs ; and, among thousands of examples, we will select some of the most accessible and convincing. Polypes have always been placed systemati- cally below the Medusae ; in the development of many. 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 work.. Schmidt, Dr. (Eduard Oskar), 1823-1886. New York, D. Appleton and Co.