Intergradents, 85, 86; hybrid, 85, 86; mutational, 85, 86; specific, 85, 86 Interjections, negligible part of human language, 247 Interpretation, ontogenetic, an alternative for phylogenetic, 302 Intervals, 105; lost, unrepresented by deposition, erosion or disturbance, 105 Intravitous staining, 143 Introspection, 204, 205, 212, 225; does not create personality, 212; impossible to a material organ, 225 Intrusions, igneous, 125 Invertebrate, 293, 294; stage, 293, 294 Involution, 160 Iron, 148 Irrational man unknown either to history or prehistory, 340 Islands, 153 Islets of Langerhans, 292 Isobares, 172 Isogametes, 157 Isogamy, 157 Isomers, 173 Isostacy, 113, 114 Isostatic equilibrium, 114 Jacob’s Cavern, in Missouri, 340 Java, 313 Jaw, 331, 340; lower, 331; lower missing, 340 Jimson Weed, 21, 22 Judgment, 207, 220 Jupiter, 184 Jura, 103 Jura, European, 96, 106 Jurassic, 117 Kena Kakoe, 346-348; extinct volcano, 346 Kidney, 280-283; adult, 282; embryonic, 283; fish, 280, 282; mammalian, 280; permanent, 281, 284 Kiluea, observatory at volcano of, 346 Kingdom, animal, 249 Kleistogamy, 159 Knowledge, 190, 191, 221, 256; conceptional, 221; experimental, 256; technical, absence of, does not always disqualify, 190, 191 Krapina, 330, 332; type of, 330 Laboratory syntheses differ from those occurring in organism, 150 La Chapelle-aux-Saints remains, 232, 330-333 Lamarckism, 6, 7, 13, 15, 16, 24, 29, 46 _note_, 53, 67, 78, 79, 263, 265, 266, 291; recent revival of, 266 Lamps, 340 La Naulette remains, 326, 332; alleged to be distinct species, 332; absence of chin, 326; allied to Neanderthal type, 326 Land bridges, 112 Language, 245, 246, 247, 330, 338, 339; descriptive, conceptual and articulate, 246, 247; first step in formation of, 245; formation of, presupposes an artist as great as his works, 339; human, 246, 247; indicative, emotional and articulate, 247, 256; of animals, 245, 246, 247; of savage races point to former civilization, 330 La Quina, industry of, 331 Law, definition of, 166, 167 Law of Weber, 227 “Learning” of animals, 243 Le Moustier, 329, 332; remains, 322, 326, 329, 330 Lemuroids, 275 Lemurs, 312 Lepontine Alps, 109 Lethals, balanced, 25-28 Lias, 119 Liberalism, 257