Collignon, 87, 135, 150 Comparative psychology, 3 _ff._ Cope, 10 Cortes, 186 Cousin, xvi Criminality, 106 Crusades, 93, 109 Cuba, 116 Darwin, 140, 148 Delusions, 108 Destructive impulse, 115 Divorce, 94 Dolichocephaly, 129 Dominant ideas, 110 Draper, 180 Dreams, 108 Dumont, 98 Economics, 182 Education, 53 Ellis, 94, 141 Emerson, ix Erotomania, 114 Eskimo, 89, 118, 132, 145 Ethnic ideas, 21 —psychology, defined, vii _ff._ —— a natural science, xii Exaltation, 113 Ezzelino da Romano, 115 Faculties, disuse of, 68 Farr, 183 Feminism, 140 Féré, 87 Ferrero, 114 Folk, 33 Folklore, 51 Forethought, 61 Fouillée, 131 Fuegian, 18, 34, 127, 132 Galton, 91, 92 Gambetta, 127 Gerland, 77, 187, 190 Gobineau, 153 Goethe, 55, 138, 178 Goitre, 101 Group, defined, 33, 42 Guaranis, 113 Haeckel, 132 Hale, 105 Haliburton, 134 Hegel, 180, 182 Height, 134 Heredity, 147 Hervé, 133, 140, 153 Home-sickness, 117 Hovelacque, 153 Humboldt, von, A., 89, 197 —— W., 28 Hurons, 112 Hybridity, 152 Hypersthenia, 112 Hysteria, 112 Iconoclasm, 116 Ideal, The, 9 Ideas, elementary, 20 —ethnic, 21 Ideation, 4 Ihering, von, 180 Iles, 80 Imagination, 8 Imbecility, 105 Incas, 199 India, 70, 109, 176 Individual and Group, contrasted, 23 _ff._ Indo-Chinese, 140 Indo-European, 166 Indonesian, 133 Industry, 54 Infanticide, 137 Instinct, 6 _ff._ Intellectual Deficiency, 104 —Process, 13 Intelligence 6 Inventiveness, 56 Ireland, 83 Iroquois, 185 Jacoby, 151 Japanese, 133 Jesuits, 112 Jevons, 13 Jews, 102, 161, 195, 196 Jingoism, 115 Johnson, 89 Kamchatkan, 108, 132 Kant, 143 Klemm, 55 Kohlbrügge, 152 Kolb, 183 Krafft-Ebing, 94 Krejči, 23 Lamarck, 148 Land and Water, distribution of, 185 Language, 18, 164 Lapouge, 99, 111, 128, 130 Lapps, 118, 134 Law, 167 Laycock, 119 Lazarus, vii Lenguas, 162 Leon, de, 187 Letourneau, ix, 61, 159 Libyans, 199 Licentiousness, 94 Lichtenstein, 14 Liebig, 127 Livi, 131 Locke, 4 Lombroso, 131 Lykanthropy, 109 Malaria, 100, 193 Malay, 12, 112, 113, 187 Malthus, 139 Mania, epidemic, 109 Manouvrier, 143 Marriage, 170 _ff._ — abstention from, 92 — premature and delayed, 91 Mason, 190 Mayas, 71, 92, 131 Melancholia, 117 Menschikoff, 180 Mental Shock, 102 Mexicans, 99, 186 Mill, 124 Mind, human and brute, compared, 3 _ff._ —mechanical action of, 14 —unity of, 3 _ff._ —of the Group, 23 _ff._ —— not creative, 30 Mindeleff, 190 Modes of Progress, 72 Mohammedan, 111 Moisture, 192 Montaigne, 184 Morgan, 80 Mortillet, de, 77 Müller, 136 Muscular System, 134 Napoleon, 44 Natality, diminution of, 96 Nation, 33 Nervous System, 132 Neurasthenia, 118 Nippur, 76 Normans, 151 Northmen, 161 Nostalgia, 117 Nott, 153 Nutrition, 190 —imperfect, 87