[3018] Felkin, ‘Contribution to the Determination of Sex,’ in ‘Edinburgh Medical Journal,’ vol. xxxii. pt. i. pp. 233-236.
[3019] Jacobs, in ‘Jour. Anthr. Inst.,’ vol. xv. pp. 44, et seq.
[3020] Bell, ‘The History of Improved Short-Horn, or Durham Cattle,’ p. 351.
[3021] Carr, ‘The History of the Rise and Progress of the Killerby, Studley, and Warlaby Herds of Shorthorns,’ p. 98.
[3022] Janke, loc. cit. pp. 373, et seq.
[3023] Shortt, in ‘Trans. Ethn. Soc.,’ N. S. vol. vii. p. 285.
[3024] Metz, loc. cit. p. 131.
[3025] Metz, loc. cit. p. 131.
[3026] Theal, loc. cit. pp. 16, et seq.
[3027] Jacobs, in ‘Jour. Anthr. Inst.,’ vol. xv. p. 26. Mr. Jacobs thinks that English Jews marry their first cousins to the extent of 7·5 per cent. of all marriages, against a proportion of about 2 per cent. for England generally, as calculated by Professor G. H. Darwin. M. Stieda, in his ‘Eheschliessungen in Elsass-Lothringen’ (1872-1876), gives the proportion of consanguineous marriages among Jews as 23·02 per thousand, against 1·86 for Protestants, and 9·97 for Catholics (Jacobs, ‘Studies in Jewish Statistics,’ p. 53).