INDEX. 



417 



Pelican, 329, 332 



Penguins, 327 



Perching birds, 337 



Petrels, 329 



Pheasants, 333 



Physiology, 4, 7 2 -97 ( see also 



Special Functions) 

 Pigeons, 334 

 Placentals, 344, 349 

 Planarians, 187, 188 

 Plant lice, 251 

 Plants and animals, 49 

 Plover, 333 

 Polyps, 175 

 Porifera, 19, 22, 163 

 Porpoises, 350 

 Portugese man-of-war, 177 

 Primates, 355 



Protective adaptations, 139 

 Proteids, 40, 51 

 Protoplasm, 39, 41, 73 

 Protozoa, 19, 22, 154 

 Pupa, 106 



Quail, 333 



Rabbits, 351 

 Races of men, 370 

 Rats, 351, 352 



Recapitulation, 387, 388, 390 

 Regeneration, 182, 202, 213, 310 

 Reproduction, 87, 98, 101 



Sponges, 1 66 



Coelenterates, 178, 179 



Flat-worms, 187 



Annulates, 199, 202 



Echinoderms, 212 



Mollusks, 222 



Arthropods, 261 



Fishes, 289 



Amphibians, 299 



Reptiles, 314 



Birds, 324 



Mammals, 343 

 Reptilian birds, 326 

 Respiration, 43, 78, 81, 297, 308, 



3 2 4 



Rodents, 351 

 Rotifers, 193 



27 



Round worms, 192 

 Rudimentary organs, 386 

 Ruminants, 354 



Salamanders, 302 



Salmon, 290 



Scorpions, 253 



Sea anemones, 179, 180 



Sea-fans, 181 



Sea-horse, 142 



Segmentation, 61, 195 



Segmented worms, 19, 21, 195 



Sense organs, 90, 91, 92, 93, 96, 



222, 259 (see also Eyes, etc.) 

 Sex, 100 

 Sharks, 290 

 Shell, 220 

 Skates, 290 

 Skeleton, 85, 164, 181, 232, 282, 



296, 321 



Skull, 283, 307, 322, 361, 302 

 Snails, 277 

 Snakes, 310, 311 

 Snipe, 333 



Social life of animals, 135, 365 

 Sparrows, 337 

 Sperm, 89, 100 

 Spiders, 234, 252, 254 

 Spinal cord, 288 

 Spore animals, 1 58 

 Spring-tails, 242 

 Squirrels, 351 

 Starfish, 206, 207 

 Stimulus, 41 

 Stomach, 323, 348 

 Struggle for existence, 131, 1 50 

 Sturgeon, 291 

 Survival of the fittest, 394 

 Supplementary exercises, 8, 15, 



43. 54> 96. iri > I2 3> I 5 I> l ^ 2 ' 

 184, 194, 204, 214, 230, 271, 

 294, 3S. 3 l6 . 337. 35 8 > 372, 

 37 8 . 395. 47 



Swans, 331 



Symbiosis, 138 



Symmetry, 60, 178, 212, 213, 275 



Tape-worms, 189, 192 

 Teeth, 348 



