Note 96 — Chapter XII · HOW THE RACES WERE PHYSIOLOGICALLY SEPARATED, AND THE DIFFERENT VARIETIES FORMED BY THEIR INTER-MIXTURE. THEY ARE UNEQUAL IN STRENGTH AND BEAUTY
Adrian Collins translation
The physiological characteristics of the ancestors are reproduced in their descendants according to fixed rules. Thus we see in South America that though the children of a white man and a negress may have straight soft hair, yet the crisp woolly hair invariably appears in the second generation (A. d’Orbigny, l’Homme américain, vol. i, p. 143).