- Johnson, Roswell, 207
- Jordan, D.S., 324
- Jörger, 42
- Jukes family, 41
- Kaan, 91
- Kellerman, Ivy, 369
- Key, Ellen, 100 et seq., 130, 229, 394
- Kirkup, 384
- Krafft-Ebing, 92
- Krauss, F.S., 92
- Kuczynski, 142
- Labour movement and war, 329
- La Chapelle, E.P., 145
- Lacour, L., 68
- Lagorgette, 315
- Laissez-faire, the maxim of, 3, 400
- Lancaster, 231
- Language, international, 349 et seq.
- Latin as an international language, 354
- Lavelege, E. de, 321
- Law, in relation to eugenics, 30, 45;
- to morals, 48;
- the sphere of, 312
- Lea, 88
- Leau, 350
- Leibnitz, 350
- Levy, Miriam, 221
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