INDEX. 



633 



Pictet, Prof., on close alliance of 

 fossils in consecutiveformations, 

 362. 



, on change in latest tertiary 



forms, 329. 

 -, on early transitional links. 



334. 

 Pierce, Mr. , on varieties of wolves, 



83. 

 Pigeons with feathered feet and 



skin between toes, 11. 

 , breeds described, and origin 



of, 18. 



breeds of, how produced. 



33, 35. 



— , tumbler, not being able to 

 get out of egg, 80. 

 — , reverting to blue color, 151. 

 — , instinct of tumbling, 248. 

 -, young of, 462, 



Pigs, black, not affected by the 

 paint-root, 11. 



, modified by want of exer- 

 cise, 189. 



Pistil, rudimentary, 468. 



Plants, poisonous, not affecting 

 certain colored animals, 11. 



, selection, applied to, 31. 



■, gradual improvement of, 31. 



, not improved in barbarous 



countries, 32. 

 -, dimorphic, 42, 297. 



, destroyed by insects, 63. 



, in midst of range, have to 



struggle with other plants, 71. 



, nectar of, 86. 



■ , fleshy, on sea-shores, 127. 



, climbing, 175, 232. 



fresh-water, distribution of, 



407. 

 , low in scale, widely dis 



tributed, 423. 

 Pleuronectidae, 



their 



220 

 Plumage, laws of 



sexes of birds, 82. 

 Plums in the United States. 

 Pointer dog, origin of, 3C. 



, habits of, 248. 



Poison not affecting certain 



colored animals, 11. 



Poison, similar effect of, on ani- 

 mals and plants, 500. 



Pollen of fir-trees, 195. 



transported by various 



means, 183, 191. 



Pollinia, their development, 230. 



Polyzoa, their avicularia, 228. 



Poole, Col., on striped hemionus, 

 154. 



Potemogeton, 408. 



Pouchet, on the colors of flat-fish, 

 222. 



Prestwich, Mr., on English and 

 French eocene formations, 355. 



Proctotrupes, 169. 



Proteolepas, 140. 



Proteus, 133. 



Psychology, future progress of, 



504. 

 I Pyrgoma, found in the chalky 

 ■ 336. 



Quagga, striped, 154. 



Quatref ages, M. , on hybrid moths, 



283. 

 Quercus, variability of, 48. 

 Quince, grafts of, 290. 



Rabbits, disposition of young, 

 249. 



Races, domestic, characters of, 14. 



Race-horses, Arab, 30. 



, English, 381. 



Radcliffe, Dr., the electrical or- 

 gans of the torpedo, 178. 



Ramond, on plants of Pyrenees, 

 391. 



Ramsay, Prof. , on subaerial denu- 

 dation, 316. 



, on thickness of the British 



formations, 317. 

 -, on faults, 317. 



structure, 

 changes in 



78. 



Ramsay, Mr., on instincts of 



cuckoo, 252. 

 Ratio of increase, 60. 

 Rats supplanting each other, 70. 

 , acclimatization of, 134. 



, blind, in cave, 131. 



Rattle-snake, 192. 

 Reason and instinct. 242. 

 Recapitulation, general, 476. 



