INDEX 



581 



Protoplasm, 43, 69, 71, 122, 499. 



Protozoa, 300-319. 



Pruning, 176. 



Pseudopod, 309. 



Psychology, of digestion, 532. 



Pteridophytes, 240. 



Ptyalin, 476. 



Puff-ball, 268. 



Pulse, 490. 



Pupa, 383, 384. 



Pylorus, 33. 



Q 



Quarter-sawing, 186. 



Radicle, 83. 



Reflexes, 510. 



Regeneration, of Hydra, 329 ; of 

 starfish, 357. 



Rennin, 477. 



Repair, 44, 499. 



Reproduction, 16, 27 ; asexual plant, 

 225-227 ; asexual animal (see 

 budding) ; frog, 57-65 ; bean, 76- 

 85 ; animal and plant compared, 

 131; seed-plants, 146-156, 196- 

 227; fern, 235-240; moss, 243- 

 245 ; various spore-plants, 246- 

 254 ; Paramecium, 302, 305 ; amoe- 

 ba, 310; sponge, 322; Hydra, 

 328; hydroids, 334; corals, 337; 

 earthworm, 351-353 ; insects, 

 384-387 ; vertebrates, 442-453 ; 

 fishes, 443; birds, 446; reptiles, 

 447 ; mammals, 447-453. 



Reptiles, 426-428. 



Resemblances t -jn classification, 138. 



Respiration, 55; human, 502-508; 

 plant, 110. See also oxygen-sup- 

 ply, and excretion of CO 2 . 



Retina, 516. 



Rhizoids, 236. 



Rings, annual, 170. 



Root-cap, 70. 



Root-hairs, 69, 89. 



Root-pressure, 89. 



Roots, 68-70; 88; 156-163. 



Rootstock, 182 ; fern, 233. 

 Root-tubercles, 69, 159, 287. 

 Rudiments, 563. 

 Rusts, 259. 



Saliva, human, 467. 



Salmon, 422. 



Sandworm, 348. 



Sanitation, 526. 



Sap, 130. 



Saprophyte, 100. 



Scale-leaves, 193. 



Sciences, 2. 



Scorpion, 377. 



Sea-anemone, 336. 



Sea-fans, 338. 



Sea-urchin, 355. 



Sea-weeds, 246, 251. 



Secretions, 48; digestive, 474; sali- 

 vary, 474 ; gastric t .477 ; intestinal, 

 479 ; pancreatic, 480 ; bile, 480. 



Seed-distributionr^lO. 



Seedlings, 146-156. 



Seed-plants, 146-231. 



Seeds, bean, 81-83; various, 146- 

 156. 



Segmentxcrayfish, 360 ; insects, 381 ; 

 worm, 347. 



Sense-organs, 27, 362. 



Senses, special, 515-519. 



Sensitive plant, 18. 



Sepal, 203. 



Sewage, bacteria in, 289. 



Shad, 423. 



Sieve-tubes, work of, 106. 



Silver-moth, 387. 



Skeleton, coral, 337 ; crustacean, 

 359; frog, 30; human, 457; 

 insect, 381. 



Skin, human, 508, 519, 521-524; 

 hygiene, 533-535. 



Sleep, of plants, 118; human, 536. 



Sleeping sickness, 314. 



Slugs, 411. 



Smallpox, 295. 



Smut, 259. 



Snail, 410. 



Soap, in hygiene, 533. 



