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Updated: July 16, 2025
The jaws, which are first developed in the fish, now articulate more perfectly with the skull. Fat-glands appear in the skin, and it is probably from a group of these that the milk-glands are developed. The origin of the hairs is somewhat obscure.
This is a group of cell-citizens of the highest rank, descended originally from the great primitive skin-sheet, which have formed themselves into chemical laboratories, ferment-factories for the production of the various secretions required by the body, from the simplest watery mucus, as in the mouth, or the mere lubricant, as in the fat-glands of the hair-follicles, to the most complex gastric or pancreatic juice.
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