442 



INDEX 



Reptilia, classification of, 291. 

 Respiration, artificial, 389; 



in leaves, 137; 



necessity for, 380; 



organs of , in frog, 380; 



organs of, in man, 381; 



tissue, 385; 



under nervous control, 38 

 Resurrection fern, 148. 

 Retina, 423. 

 Rhizome, 153. 

 Rib and vertebra, 373. 

 Rodents, 311; 



beaver, 313; 



rabbit, 311; 



skull of, 309. 

 Root, adventitious, 96; 



air, 97 ; 



downward pressure in (Exp.), 85; 



effect of moisture on (Exp.), 83; 



fine structure of, 87; 



geotropism in, 83, 85; 



growing point in, 85; 



osmosis in, 89; 



parasitic, 97; 



passage of soil water within, 89 ; 



water, 96; 



cap, 86; 



pressure, 113; 



hairs, 86, 88, 93 



system, 82. 

 Rootstock, 118; 



in ferns, 153. 

 Rusts, 164, 165. 



Sac, embryo, 34. 

 Salamander, spotted, 284. 

 Salt, importance of, 319. 

 Samara, 55. 

 Sand dollar, 207. 

 Sap, ascent of, 113. 

 Saprophyte, defined, 159. 

 Saprophytic fungi. See Mold and 



Mushroom. 

 Scallop, 265. 

 Science and Matter, 11. 

 Scutes, 289. 

 Sea anemone, 200. 

 Sea cucumber, 207. 



Sea lily, 207. 



Sea lion, 314. 



Sea urchin, 206, 207. 



Seed dispersal, 57. 



Seeds, winged, 60. 



Selective planting, 81. 



Self-control versus appetite, 418. 



Self-pollination, 42; 



prevention of, 45. 

 Semicircular canals, functions of, in 



birds, 293. 

 Senses, hearing, 421; 



sight, 423, 425; 



smell, 420; 



taste, 419; 



temperature, 419; 



touch, 419. 

 Sensitive leaves, 128. 

 Sepal, 31. 

 Seta, 209. 

 Sexual reproduction, in amoeba, 183; 



in fern, 154; 



in mold, 161; 



in moss, 158; 



in paramcecium, 181. 

 Ship worm, timber bored by, 269. 

 Shrimp, 221, 222. 

 Silkworms, American, 237. 

 Silicle, 54. 

 Silique, 54. 

 Skeleton, growth of, 376; 



hygiene of, 377 ; 



in adult and child, 377; 



in frog and man, 371 ; 



of dog, 309; 



structure of, 371; 



uses of, 371. 

 Skin, an organ of excretion, 391, 396; 



an organ of sensation, 395, 419; 



glands in, 395; 



importance of cleanliness, 398; 



importance of proper clothing, 398 : 



layers in, 394, 395; 



structure of, 395. 

 Skull, bones in man, 375 ; 



in man and frog, 374; 



of dog, 313. 

 Sleep movements, 127. 

 Snakes, adaptation in, 289. 



