[Illustration: _Frontispiece._ LUMINOUS FISH OF THE DEEP SEA. (For description see Footnote 25, and List of Illustrations.)] Although the present volume, as giving an account of the _vertebrate_ animals, is a natural sequel to, and completion of, my former book, _Life and her Children_, which treated of _invertebrates_, yet it is a more independent work, both in plan and execution, than I had at first contemplated.…
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