[1628] Reade, loc. cit. pp. 545, 549. Johnston, loc. cit. p. 436.
[1629] Duvernoy, art. ‘Propagation,’ in ‘Dictionnaire universel d’histoire naturelle,’ vol. x. p. 546.
[1630] Geoffroy Saint-Hilaire, ‘Histoire naturelle générale,’ vol. iii. p. 180.
[1631] Ibid., vol. iii. pp. 175, 185, et seq. de Quatrefages, loc. cit. p. 67.
[1632] Vogt, ‘Lectures on Man,’ p. 414.
[1633] Geoffroy Saint-Hilaire, vol. iii. p. 191.
[1634] Geoffroy Saint-Hilaire, ‘Histoire naturelle,’ vol. iii. pp. 169-175.
[1635] Darwin, ‘Animals and Plants under Domestication,’ vol. ii. p. 189.
[1636] Geoffroy Saint-Hilaire, vol. iii. p. 208. Blumenbach, ‘Anthropological Treatises,’ p. 73.
[1637] Geoffroy Saint-Hilaire, vol. iii. pp. 213, et seq.