INDEX. 



497 



Papaver bracteatum, 194. 

 Paraguay, cattle destroyed by flies, 



63. 

 Parasites, 238. 



Partridge, with ball of earth at- 

 tached to foot, 363. 

 Parts greatly developed, variable, 



130. 

 Parus major, 158. 

 Passiflora, 264. 

 Peaches in United States, 74. 

 Pear, grafts of, 272. 

 Pedicellarise, 213. 

 Pelargonium, flowers of, 130. 



sterility of, 264. 

 Pelvis of women, 129. 

 Peloria, 130. 

 Period, glacial, 365. 

 Petrels, habits of, 150. 

 Phasianus, fertility of hybrids, 265. 

 Pheasant, young, wild, 233. 

 Pictet, Prof., on groups of species 

 suddenly appearing, 313. 

 on rate of organic change, 320. 

 on continuous succession of 



genera, 322. 

 on close alliance of fossils in con- 

 secutive formations, 340. 

 on change in latest tertiary forms, 



313. 

 on early transitional links, 316. 

 Pierce, Mr., on varieties of wolves, 



79. 

 Pigeons with feathered feet, and 

 skin between toes, 10. 

 breeds described, and origin of, 



17. 

 breeds of, how produced, 32, 34. 

 tumbler, not being able to get 



out of egg, 75. 

 reverting to blue color, 141. 

 instinct of tumbling, 233. 

 young of, 434. 

 Pigs, black, not affected by the 

 paint-root, 10. 

 modified by want of exercise, 178. 

 Pistil, rudimentary, 439. 

 Plants, poisonous, not affecting 

 certain colored animals, 10. 

 selection, applied to, 29. 

 gradual improvement of, 30. 

 not improved in barbarous coun- 

 tries, 30. 

 dimorphic, 40, 280. 

 destroyed by insects, 60. 



Plants, in midst of range, have to 



struggle with other plants, 67. 



nectar of, 83. 



fleshy, on seashores, 120. 



climbing, 165, 217. 



fresh-water, distribution of, 382. 



low in scale, widely distributed, 

 397. 

 Pleuronectidse, their structure, 207. 

 Plumage, laws of changes in sexes 



of birds, 78. 

 Plums in the United States, 74. 

 Pointer dog, origin of, 28. 



habits of, 232. 

 Poison not affecting certain colored 

 animals, 10. 



similar effect of, on animals and 

 plants, 469. 

 Pollen of fir-trees, 183. 



transported by various means, 

 172, 180. 

 Pollinia, their development, 216. 

 Polyzoa, their avicularia, 214. 

 Poole, Col., on striped hemionus, 



143. 

 Poteamogeton, 383. 

 Pouchet, on the colors of fiat-fish, 



209. 

 Prestwich, Mr., on English and 

 French eocene formations, 334. 

 Proctotrupes, 159. 

 Proteolepas, 132. 

 Proteus, 125. 



Psychology, future progress of, 473. 

 Pyrgoma, found in the chalk, 315. 



Quagga, striped, 143. 

 Quatrefages, M., on hybrid moths, 



266. 

 Quercus, variability of, 45. 

 Quince, grafts of, 272. 



Rabbits, disposition of young, 233. 

 Races, domestic, characters of, 14. 

 Race-horses, Arab, 29. 



English, 357. 

 Radcliffe, Dr., the electrical organs 



of the torpedo, 168. 

 Raymond, on plants of Pyrenees, 



367. 

 Ramsay, Prof., on subaerial denu- 

 dation, 296. 

 on thickness of the British forma- 

 tions, 297. 

 on faults, 297. 



