DOCTOR OF MEDICINE, LICENTIATE OF NATURAL SCIENCE, AIDE-NATURALISTE IN THE MUSEUM OF ROUEN, MEMBER OF THE ANTHROPOLOGICAL SOCIETY OF PARIS, CORRESPONDING MEMBER OF THE ANTHROPOLOGICAL SOCIETY OF LONDON, ETC. A few words by way of preface to a book on the _Plurality of the Human Race_ are necessary as well as advisable. They are especially so when the Author and Editor differ considerably in their opinions, as in this case; and although it is by no means a _sine quâ non_ that they should always agree, there are certain points on which a few lines may be required.…
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