382 



INDEX. 



Protohippus, 95 

 Protoplasm, 9, 6 1 et seq., 3^2 

 Protozoa, 46, 55 

 Protozoa, development of, 183 

 Pseudis, 238 

 Pseud-ovum, 290 

 Psyche, 289 

 Pteridophytes, 56 

 Pterodactyls, 164 

 Pteronarcys, 268 

 Pteropoda, 45, 222, 229, 246 

 Pupa, 203 



Q 



Quadrate bone, 135, 155 

 R 



Races, 33, 142 

 Radiata, 40 

 Ramsay, 369 

 Recent rocks, 93 

 Relation, 23 

 Remak, 63 

 Reproduction, 22 

 Reptiles and birds, 154 

 Reversion, 100, 142, 248 

 Rhinoderma, 239 

 Rock formations, table of, 368 

 Rose, 132 

 Rose, fruit of, 140 

 Rotifera, 227, 271, 360 

 Rudimentary organs, 10, 33, 80 et scq. 

 282 



Sacculina, 32, 202, 205 et scq., 351 

 Sacrum, 155 

 Salamander, 242, 244 

 Salmon, 103 

 Salvia, 336 



Sarcode (see Protoplasm) 

 Schultz, 63 

 Scrophularia, 83 

 Sea-acorns, 202, 352 

 Sea-butterflies (sec Pteropoda) 

 Sea-cucumbers, 199 

 Sea-hares, 228 

 Sea-lemons, 228 

 Sea-lilies (see Crinoids) 

 Sea-mats, 230, 233, 283 

 Sea- squirts, 54, 174 

 Sea-squirts, development > r , 17 Betsey. 

 356 



Sea-urchins, 195, 197 

 Sea-weeds, 56, 58, 69 

 Seeds, 82, 309, 317, 318 

 Segmentation of egg, 173, 184 

 Selection (see Natural and Sexual 



selection) 



Self- fertilization, 319 

 Sensations, 66, 67 

 Sensitive plant, 68 

 Serpula, 231 

 Sexual selection, 8, 9 

 Shark, 102 

 Shipworm, 223 

 S^ort-styled flowers, 320 

 Shrimp, 32 

 Siredon (see Axolotl) 

 Sitaris, 247 

 Sloe, 138 

 Smilax, 138 

 Snapdragon, 83 

 Solenobia, 289 

 Solitaire, 88 

 Species, 5, 7, 8, 38 

 Species, origin of, i, 2, 4, 7, 8, 12 

 Spence, 191, 192 

 Spencer, 2, 3, 16, 17, 52, 60 

 Spider m.nkey, 98 

 Spine of man, 99 

 Splint bones, 92 et seg., 96 

 Sponge, 278, 279 

 Sponge, development of, 172 

 Spore, 58 



Sprengel, 330, 333, 339 

 Springtails, 257 



Stability of living beings, 344. 345 

 Stamen, 82, 131, 312 et set/., 318 

 Star-fishes, 195, 196, 287 

 Stipules, 137 

 Strawberries, 140 

 Struggle Lr existence, 7 

 Stylops, 354 

 Succession of life, 370 

 Sunbirds, 249 

 Surinam toad, 239 

 Survival of fittest, 8 

 Swifts, 249 



Swimming-bladder (see Air-bladder) 

 Sympathetic system, 43 



Tadpole, history of, 236 

 Tails of an'ma's, 9^ et seq. 

 Tapeworm, 285, 350 



