Index. 
relation to the formation of galls, 
293-295, 446-448. 
Nature, organic, 17; inorganic, I, 
17, 18. 
Nauplius, 138. 
Neumayr, 19. 
New Zealand, fauna of, 68, 204, 
205; thriving of exotic species 
in, 286. 
Newman, on the IIlative Sense, 6, 
Newton, his idea of scientific 
method, 6. 
Nictitating membrane, 74, 75. 
Notochord, 146. 
Novum Organon, the, on scientific 
method, 2. 
Nucleus, 105, 112-134. 
Nucleus-spindle, 129. 
Nut-hatch, Syrian, 
nests of, 381. 
Oo. 
Objective methods, 6. 
Oceanic islands, see Islands. 
Octopus, eye of, 57, 58, 348-350. 
Qdicnemus crepitans, 320. 
Ontogeny, as recapitulation of 
phylogeny, 98-104. 
Orang Outang, see Apes. 
Oredon Culbertsoni, 167. 
Origin of Specics, the, influence 
exercised by, on ideas of method, 
ornamented 
1-9. 
Ovok pus, 189. 
Otaria, eye of, 75. 
Ovum, 113-142; human, 120-123; 
amoeboid movements of young, 
121-123; segmentation of, 134, 
135. 
Owen, on ear of whale, 65; on 
natural selection, 333, 334. 
Owl, eye of, 75. 
P. 
Paddle, see Whale,and Baftanodon 
discus. 
Pagurus bernhardus, 64. 
Pain, in relation to the theory of 
evolution, 417. 
Paleontology, 159-203; general 
testimony of, 156-165; te-timony 
of, in particular cases, 165-203 ; 
457 
consideration of objections to 
theory of evolution founded on 
grounds of, 156-165, and Ap- 
pendix. 
Palaotherium, 190, 191. 
Paley, on natural theology, 98, 412. 
Paludina, successive forms of, 19. 
Panama, Isthmus of, 219. 
Panniculus carnosts, 77. 
Lapilio merope, 330. 
Parasites, of animals, devoid of 
beauty, 408, 
Parsimony, law of, 272. 
Parthenogenesis, 119. 
Partridges, 319. 
Peacock, tail of, 378 ; courtship of, 
3. 
Peckham, Mr. and Mrs., on court- 
ship of spiders, 388-390. 
Perissodactyls, 182-192. 
Letromyzon marinus, 148. 
Phenacodus primaevus, 184, 185. 
Phylogeny, see Ontogeny. 
Physiological selection, 376. 
Pig, embryology of, 153; feet of, 
176, 187 ; portraits of wild and 
domesticated, 312. 
Pigeons, portraits of, 298, 299; 
feather-footed, 359. 
Pilot fish, 289. 
Planorbis, transmutations of, 200, 
201. 
Pleasure and pain, in relation to 
the theory of evolution, 417. 
Plica semilunarts, 75. 
Pliohippus, ‘89 
Polar bear, skeleton of, 174; feet 
of, 178. 
Polar bodies, 125, 126. 
Polar star, 129. 
Polyps, 114. 
Porpoises, 24, 25, 50. 
Poulton, E. B., on warning colours, 
325, 326; on mimicry, 331, 332; 
sexual selection, 400, 401, 449, 
450. 
Poultry, portraits of, 300-302, 
Pronucleus, 126-128. 
Prophetic types, 272, 351-362. 
Prophysema primordiale, 140. 
Protective colouring, 317-323. 
Protohippus, 189. 
