The Secret Doctrine, Volume II. Anthropogenesis

Chapter 1632

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“At this period,” writes Darwin, “the arteries run in arch-like branches, as if to carry the blood to branchiæ which are not present in the higher vertebrata, though the slits on the side of the neck still remain, marking their former [?] position.”

It is noteworthy that, though gill-clefts are absolutely useless to all but amphibia and fishes, etc., their appearance is regularly noted in the fœtal development of vertebrates. Even children are occasionally born with an opening in the neck corresponding to one of the clefts.

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