494 



INDEX 



i. 308; wide range as compared with 

 animals, i. 423 ; Darwin's interest in 

 movements of, ii. 249 ; Darwin on 

 physiology of, ii. 52 ; disease in, ii. 

 425 ; effect of stimuli on, ii. 51, 424, 

 426 



Plas Edwards, i. 4 



Plasmodiophora, action on cruciferous 

 roots, ii. 422 



Platanthera, H. Muller on, ii. 375 



Plato, comparison between plants and 

 man in his Timceus, ii. 426 



Platysma myoides, contraction during 

 terror, ii. 108 ; Darwin's error con- 

 cerning, ii. 107 



Playfair, Lord, i. 315 ; ii. 198, 435, 



436 

 Pleistocene Antarctic land, plants de- 

 rived from, i. 491 

 Pliocene, Falconer on mammal from 



the, i. 244 

 Plovers, protective colouring of, ii. 87 

 Plumage, immature and adult, ii. 81 

 Plumbago, Darwin's experiments on, ii. 



352 ; said to be dimorphic, ii 350 

 Podostemacese, fertilisation of, ii. 255 

 Poisons, natives of Australia injured by 

 vegetable, i. 469 ; absorption by roots 

 of, ii. 290 ; effect of injection into 

 plants, ii. 427 

 Polar bear, modification of, i. 162, 179 

 Polar ice-cap, Darwin on the, ii. 163, 



167 

 P„olarity, E. Forbes' theory of, i. 77, 84, 



128, 305 

 Pollen, direct action of, i. 285 ; ex- 

 periments on, i. 219 ; time of maturity 

 in Eucalyptus and Mimosa, i. 445 ; 

 mechanism for distribution in Martha, 

 ii. 354 ; Miyoshi's experiments on 

 tubes of, ii. 312, 313 

 Polyanthus, crossing in, i. 219 

 Polyborus Nova Zelandice, in Falkland 



Islands, i. 408 

 Polydactylism, and inheritance, i. 251 

 Polyembryony, in Coffea and Fachira, 



"■ 3 6 5 

 Polygala, i. 36 ; P. vulgaris, variation 



of, i. 102 



Polygamy, in birds, ii. 65, 69 ; in 



Machetes, ii. 69 

 Polygonum, germination of seeds found 



in sandpit, ii. 246 

 Polymorphism, i. 56, 414 ; Darwin 



and Hooker on, i. 412 ; Wallace on, 



i. 266 

 Polytypic genera, variation of, i. 106 

 Pontederia, heterostylism of, ii. 358-60 

 Pontodrilus, Lankester on, ii. 215 

 Poplar, Heer on fossil species, ii. 239 



Popper, J., letter to, ii. 445 



Poppig, on civilisation and savagery, ii. 



46 

 Poppy (corn-), indigenous in Sicily, i. 



450 

 Porpoises, Flower on, ii. 8 ; freshwater, 



ii. 8 ; Murray on, ii. 8 



Portillo Pass. i. 20 



Porto-Santo, land-snails of, i. 446 ; 

 plants of, i. 92 



Positivism, Huxley's article in Fort- 

 nightly Review on, i. 313 



Posoqueria, F. Midler's paper on, ii. 



35°. 354 



Potatoes, crossing experiments, i. 280 ; 

 cultivated and wild, i. 25 ; disease 

 of, i. 165 ; experiments suggested, i. 

 222 ; graft-hybrids, i. 285, 286, 359 ; 

 sterility and variability in, i. 285 ; 

 Torbitt's experiments on, i. 372-4 ; 

 Traill's experiments, i. 280; varieties 

 of. i. 219 ; Darwin's work on varieties 

 of, ii. 290 ; Hildebrand's experi- 

 ments on, ii. 354 



Poulton, Prof, on Prichard as an evo- 

 lutionist, i. 43-6 ; Charles Darwin 

 and the Theory of Natural Selection, 

 i. 28 



Poultry, skulls of, i. 180 ; Tegetmeier's 

 book on, i. 322 ; experiments on 

 colour and sexual selection, ii. 58 



Powell, Prof. Baden, i. 174, 175 



Power of Movement in Plants, Darwin's 

 account of capacity of revolving in 

 plants, in his book, ii. 345 ; Conti- 

 ental opinion of, ii. 429 ; Wiesner's 

 criticism of, ii. 431, 432 



Prawns, F. Muller on metamorphosis 

 of, i. 264 



Prayer, Galton's article on, ii. 108 



Pre-Cambrian rocks, Hicks on, ii. 169 



Predominant forms, i. 165 



Prehistoric Europe, J. Geikie's, ii. 165, 

 167 



Prehistoric Times, Lord Avebury's, 

 i. 263 



Preordination i. 192 ; speculation as to, 

 i. 321 



Prepotency of pollen, i. 298 



Prescott, reference to work by, ii. 120 



Preservation, suggested as an alterna- 

 tive term for Natural Selection, i. 161 



Pressure, effect on liquefaction by heat, 

 ii. 132 



Preston, S. Tolver, letter to, ii. 52 



Prestwich, Prof. J., letter to, ii. 193 ; 

 on Parallel Roads of Glen Roy, ii. 

 172 ; on superficial deposits of S. 

 England, ii. 237, 238 ; work on Ter- 

 tiaries, ii. 230 ; mentioned, i. 239 



