Pleurotomaria, 118 Plica, semilunaris, 297 Pliocene, 78, 95, 309, 313, 317, 323; Upper, 309, 313, 317 Pluteus, 159 Polar body, second, 159 Polariscope, 144 Polymorphism, 122 Polynesians, 325 Polynuclear condition, 138 Polyphemus, the Cyclops, 293 Pompilids, 247, 248, 263, 264 Pompilius, 247, 261 Popular trust not to be abused, 345, 346 Postauricular muscles, 304, 305 Post-glacial time, 289 Preadaptations, 46, 47, 52, 53, 63, 124, 279; adventitious appearance of, 46, 47; divergent, 279; entail modifications of specific magnitude, 47; evolution as “natural explanation” of, 53; inherited, 47 Pre-Cambrian, 100, 116, 118, 125; terranes, 125 —extension great, 125 Preformation, 3, 160 Prehension, 50, 271, 272 Prehistoric, 337 Prehuman, arboreal stage, 309, 217 Presupposition, latent in materialistic logic, 186 Pre-tertiary, 312 Primates, 308 Primitive man, 338, 342, 343; not irrational, 342, 343; not a savage, 338 Primula, 19 Principles, 171, 172; entitive and dynamic, 171, 172 Priocnemis, flavicornis, 248 Priority, 76; a “sine qua non” condition of ancestry, 76 Process, 206, 209, 225; divorced from agents, 209; of reflection entails identity of observer and observed, 225; subjectless and sourceless, of phenomenalists, 206 Prognathic face, 332 Prognathism, 325, 330, 333, 341; of upper jaw accentuated, 341 “Progress,” 355, 359; modern, 359; of science, 355 Progression, 50, 271, 272, 317; bipedal, 272; modes of, 271, 317 Prehistory, undocumented, unreliable, 340 Pronephric duct, 281 Pronephros, 280, 281 _note_ Prophylaxis, 356 Propliopithecus, 309, 311 Prosthenic, 271 Protein, 140, 144, 145, 147, 151; multimolecule of, 140 Proterotheres, 78 Proterotheriidæ, 78 Proterozoic, 104 _note_, 117 Protista, 5, 59, 136, 138, 156, 157, 163; polynuclear condition not rare among, 138 Protoplasm, 141, 143, 144, 151, 160, 161, 175, 181; dead, 143; how reinvigorated, 160, 161; invisible structure, 141; not a chemical compound but a complex system, 142, 143; persistent specificity of, 144; ultramicroscopic structure of, 143; visible, a picture of, 141 Protococcus, 151; viridis, 151 Protons, 103, 174 Protophytes, 135, 136 Protoplasmic architecture, 174 Protozoa, 117, 118, 135, 136, 170 Psyche, 179, 200 Psychic, 198, 205, 230, 233; and physical dualism of Descartes, 198; functions, 205, 233 —of organic type, 233; states, correlated with organic states, 230