INDEX. 



533 



Pictet, Prof., on close alliance of 



fossils in consecutivef ormations, 



363. 

 , on change in latest tertiary 



forms, 339. 

 , on early transitional links, 



334. 

 Pierce, Mr., on varieties of wolves, 



88. 

 Pigeons with feathered feet and 



skin between toes, 11. 

 , breeds described, and origin 



of, 18. 

 , breeds of, how produced, 



33, 85. 

 , tumbler, not being able to 



get out of egg, 80. 



, reverting to blue color, 151. 



, instinct of tumbling, 248. 



, young of, 463.' 



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, 81. 



, gradual improvement of, 31. 



, not improved in barbarous 



countries, 33. 



, dimorphic, 43, 397. 



, 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, 333. 



, fresh-water, distribution of, 



407. 

 , low in scale, widely dis- 

 tributed, 433. 

 PleuronectidsB, their structure, 



230. 

 Plumage, laws of changes in 



sexes of birds, 83. 

 Plums in the United States, 78. 

 Pointer dog, origin of, 80. 



, habits of, 348. 



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, 330. 

 Polyzoa, their avicularia, 328. 

 Poole, Col., on striped hemionus, 



154. 

 Potemogeton, 408. 

 Pouchet, on the colors of flat-fish, 



232. 

 Prestwich, Mr., on English and 



French eocene formations, 355. 

 Proctotrupes, 169. 

 Proteolepas, 140. 

 Proteus, 133. 

 Psychologv, future progress of, 



504. 

 Pyrgoma, found in the chalk, 



336. 



Quagga, Striped, 154. 



Quatref ages, M. , on hybrid moths, 



288. 

 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, 

 891. 



Ramsay, Prof., on subaerial denu- 

 dation, 816. 



, on thickness of the British 



formations, 317. 



, on faults, 317. 



Ramsay, Mr., on instincts of 

 cuckoo, 252. 



Ratio of increase, 60. 



Rats supplanting each other, 70. 



, acclimatization of, 134. 



, blind, in cave, 131. 



Rattle-snalie, 193. 



Reason and instinct, 343. 



Recapitulation, general, 476. 



