Index 
‘Oscillaria, 320. 
Ostrich, 203, 354. 
Oxalis, 290, 404. 
Oxen, 304. 
Oxide, 29. 
Packard, 231, 260, 
Paludina, 320, 322. 
Pangenesis, 233-240. 
Papilio, 158, 360, 388; polyxenes, 3. 
Paradisea, 197. 
Paramzecium, 395-398, 442-447. 
Parasitism, 352-353. 
Parker, 393. 
Parrots, 6. 
Partridge, 410. 
Passerella, 311. 
Passiflora, 148. 
Pavo, 317. 
Peach, 134. 
Peacock, 200, 317-318. 
Peafowl, 198. * 
Pearson, 265, 267, 268-270, 
Peas, 281-286. 
Peckham, 178, 408. 
Pelobates, 421. 
Pfliiger, 424, 430. 
Phosphorescent organs, 22, 133. 
Physa, 320, 322. 
Pigeons, selection in, 102, 
Pipilo, 311. 
Pisum, 278. 
Pithecia, 208. 
Planaria, 380. 
Planarians, 394. 
Plants, 403, 415; color of, 24; influence of 
light, 17. 
Plato, 304. 
Plover, 202. 
Poisons, 13, 14, 15,°18, 20, 377. 
Polar bear, 6. 
Pollen, 2, 125. 
Polygon, 262, 
Porthesia, 389. 
Primula, 361-365. 
Prionide, 182. 
Probosces of insects, 127. 
Protective coloration, 5, 6, 16, 158, 159. 
Proteus, 227. 
Protohippus, 51. 
Przibram, 347. 
Psyche, 419. 
Ptarmigan, 5. 
Pyrodes, 182. 
Quetelet, 289. 
Quiscalus, major, 173. 
469 
Rabbit, Porto Santo, 316-317. 
Rabbits, 304. 
Rabbits in Australia, 112, 
Race-horse, 134. 
Ranunculus, 305. 
Ray-florets, 135. 
Rays, electric organs of, 22, 
Réaumur, 388. 
Recapitulation theory, 58-83. 
Reduction division, 432-433. 
Regencration, 15, 16, 27, 379. 
Regulations, 27, 28. 
Reproductive organs, 19. 
Reptiles, fossil, 52, 53. 
Reugger, 205. 
Rhododendron, 330. 
Rhyncheea, 201. 
Riley, 424. 
Rivers, 28. 
Robinia, 404. 
Romanes, 132, 250-256, 412, 
Rose, 307. 
Rothert, 398. 
Rotifers, 118, 353, 424. 
Roulin, 304. 
Roundworms, 176, 353. 
Rudimentary organs, 22. 
Ryder, 260. 
Sacculina, 353. 
Sachs, 10. 
Salmon, I9. 
Salter, 314. 
Salvin, 201. 
Saphirina, 176, 
Savages, 210. 
Saw-flies, 425. 
Scarlet tanager, 198. 
Schaefer, 244. 
Sclater, 198. 
Scops, 312. 
Scott, 148, 259. 
Sea-anemone, 341. 
Sea-urchin, 341. 
Secondary sexual characters, 21. 
Selection, 116. 
Selection, artificial, 91, 92, 96, 97, 98. 
Self-fertilization, 126. 
Semper, 260. 
Setchel, 320. 
Sexual characters, secondary, 372-374. 
Sexual selection, 167. 
Sharp, 350, 425. 
Sheep, 208. 
Sherrington, 244. 
Shrew mice, 206.. 
Silkworm, 428, 447. 
