592 
Pfeffer, W., 22, 389-391, 394 
Pfitzner, W., 103 
Pflueger, 262 
Phillips, 361, 362 
Philosophy, influence of the conception of 
evolution on modern, 446-464 
Phryniscus nigricans, 281 
Phylogeny, embryology as a clue to, 173— 
176 
— Palaeontological evidence on, 188, 189, 
204-217 
Physiology of plants, 
223 
Piccard, on Geotropism, 395, 396 
Pickering, spectroscopic observations by, 
559 
Piranga erythromelas, 297 
Pisum sativum, 418 
Pithecanthropus, 127-129, 131, 135 
Pitheculités, 136 
Planema epaea, 57 
Plants, Darwin’s work on the movements 
of, 385-400 
— geographical distribution of, 298-318 
— Palaeontological record of fossil, 200- 
222 
Platanthera bifolia, 406 
Plate, 271 
Plato, 512, 513 
Playfair, 342, 362 
Pliopithecus, 127 
Pocock, R. I., 284 
Poincaré, 548, 551, 552 
Polarity, Véchting on, 234, 235 
Polymorphic species, 69, 70 
— variability in cereals, 77-84 
Polypodium incanum, 390 
Porthesia chrysorrhoea, 263, 266 
Potonié, R., 210 
Pouchet, G., 51, 260 
Pourton, E. B., on The Value of Colour 
in the Struggle for Life, 271-297 
— experiments on Butterflies by, 50, 261 
— on J. C. Prichard, 16 
— on Mimicry, 53, 54, 58, 59 
— 247, 46, 551, 651, 201, 261 
Pratt, 299 
Pratz, du, 158 
Premutation, 76 
Preuss, K. Th., 498, 505% 
Prichard, J. C., 16, 17, 86, 90? 
Primula, heterostylism in, 409-411 
P. acaulis, 410 
P. elatior, 410 
P. officinalis, 410, 411 
development of, 
Index 
Promeces viridis, 283 
Pronuba yuccasella, 60 
Protective resemblance, 50-53, 275-281 
Protocetus, 195 
Protohippus, 191 
Psychology, 497-499 
Pteridophytes, history of, 213-217 
Pteridospermeae, 211-213, 220 
Pucheran, 324 
Pusey, 115 
Quatrefages, A. de, 127, 16 
Quetelet, statistical investigations by, 72, 
225, 235, 534 
Rabl, C., 1036 
Radio-activity, 569-582 
Radiolarians, 25 
Raimannia odorata, 244 
Ramsay, Sir W. and Soddy, 573 
Ranke, 531, 533, 536, 541 
Rau, A., 142 
Ray, J., 5 
Reade, Mellard, 307, 377 
Recapitulation, the theory of, 174-176, 182 
Reduction, 182, 183, 202, 203 
Regeneration, 96!, 233, 234 
Reid, C., 3154 
Reinke, 200, 201 
Religion, Darwin’s attitude towards, 496 
— Darwin’s influence on the study of, 
494-511 
— and Magic, 504-511 
Religious thought, Darwin’s influence on, 
477-493 
Renard, on Darwin’s work on volcanic 
islands, 371, 372 
Reproduction, effect of environment on, 
230-232 
Reptiles, history of, 196, 197 
Reversion, 68, 119 
Rhinoceros, the history of the, 192, 193 
Ridley, H. N., 1154 
Riley, C. V., 280 
Ritchie, 469 
Ritual, 503 
Roberts, A., 556-560, 562! 
Robertson, T. B., 256, 258 
Robinet, 7 
Rolfe, R. A., 4071 
Rolph, 461 
Romanes, G. J., 5!, 18, 25, 42, 150, 486 
Rothert, 398, 394 
Roux, 104!, 141, 142, 262 
Rozwadowski, von, 516! 
