[1668] Darwin, ‘Animals and Plants under Domestication,’ vol. ii. pp. 148-160.
[1669] Peschel, loc. cit. p. 9. Eyre, loc. cit. vol. ii. p. 324. Lumholtz, loc. cit. p. 273.
[1670] Meyer, loc. cit. p. 186.
[1671] Taplin, loc. cit. p. 14.
[1672] Broca, loc. cit. p. 36.
[1673] Peschel, loc. cit. p. 8.
[1674] v. Görtz, ‘Reise um die Welt,’ vol. iii. p. 288.
[1675] Hensen, ‘Die Physiologie der Zeugung,’ in Hermann, ‘Handbuch der Physiologie,’ vol. vi. pt. ii. p. 191.
[1676] Darwin, ‘Animals and Plants under Domestication,’ vol. ii. pp. 182, et seq.
[1677] Jacobs, ‘On the Racial Characteristics of Modern Jews,’ in ‘Jour. Anthr. Inst.,’ vol. xv. pp. 26-28.