Note 1 — INTRODUCTION.

We must here inform the reader, once for all, that we shall use, until we say anything to the contrary, the word “race,” to designate the different natural groups of the human genus (genus Homo). We intend definitely to prove that these groups constitute veritable species. M. de Quatrefages has on this matter reproached us with a confusion, which is accounted for partly by the incorrectness of his quotation. He makes us say, “The plurality of original races, otherwise the plurality of the species, of the genus ‘man’” (Unité de l’Espèce Humaine, 1861, p. 309). It stands as follows in our own text: “The original plurality of races, otherwise the plurality of the species composing the genus ‘man,’” etc. It is evident that the confusion which is found in these words is entirely voluntary.