[1988] Preyer, ‘Specielle Physiologie des Embryo,’ p. 8.
[1989] Mitchell, ‘Blood-Relationship in Marriage,’ in ‘Memoirs Read before the Anthropological Society of London,’ vol. ii. p. 451.
[1990] Pouchet, loc. cit. p. 107, note *.
[1991] Sebright, loc. cit. pp. 11, et seq.
[1992] Darwin, ‘Cross and Self Fertilisation,’ p. 445.
[1993] Idem, ‘Animals and Plants under Domestication,’ vol. ii. p. 116.
[1994] Idem, ‘Cross and Self Fertilisation,’ p. 457.
[1995] Ibid., p. 465.
[1996] Sebright, loc. cit. p. 12.
[1997] Adam, ‘Consanguinity in Marriage,’ in ‘The Fortnightly Review,’ vol. iii. p. 81.