INDEX 



49' 



Quarantine, 205 

 Quicklime, 421 



Railroads, 299 

 Rain, 42, 347, 400, 401 

 Rainbow, 271 

 Rainfall, 347-353 



cause of, 42, 347, 401 



effect on vegetation, 348-352 



measurement of, 399-401 

 Ravine, 367, 368 

 Reflection, 243-247, 273 

 Refraction, 252-258 

 Refrigerator, 31-32 

 Rennin, 93 



Renovated butter, 100 

 Reproduction in, birds, 464465 



fish, 467 



insects, 473, 474, 477 



mammals, 463 



oysters, 470471 



plants, 427-430 

 Resistance, electric, 213214 

 Respiration, 54-57 



by fish, 469-470 



by plants, 444 

 Retina, 258 

 Rivers, as highways, 372 



forming alluvial fans, 365 



how formed, 348, 367-370 



irrigation by, 353-356 



sediment carried by, 363-364 

 Rochelle salt, 152 

 Rocks, 417-422 



effect of water upon, 358 



faulting, 409 



igneous, 417418 



metamorphic, 419-421 



sedimentary, 418-419 



stratified, 418 



the earth's crust, 409-416 



weathering of, 16-17, 48, 39I~392 

 Root, 423 



work of, 438-439 

 Root hairs, 438, 439 



Rootstock, 430 

 Rosin, 41, 184 

 Rubber, 458 

 Rust, from blueing, 165 



prevention of, 54 



spots removed, 147 



Saccharine, 98 



Salicylic acid, 116 



Saliva, 92 



Salt, and ice-cream freezer, 49 



as food preservative, 113 



as source of soda, 152 



to remove silver tarnish, 147 

 Sand, cutting power of, 388 

 Sand dunes, 389-391 

 Sandstone, 418 

 Sap, 451 



Saprophytes, 442 

 Screws, 301 

 Seaweed, protection to rock, 374, 375 



source of potash, 190 

 Sedimentary rock, 418-419 

 Seedling, 436-437 

 Seeds, food stored in, 436-437 



growth of, 437 



selection of, 432-433 

 Seidlitz powder, 152 

 Selection of seeds, 432-433 

 Sepia, 184 

 Sewage, 203-205 



as fertilizer, 190, 203-204 

 Sheep, 462 

 Shellac, 184-185 

 Silk, 1337134 



bleaching, 161 

 Silver, tarnished by coal gas, 123 



tarnish removed, 147 

 Silver chloride, 263 

 Sirups, 20, 97, 98, 459 

 Smelting, 173-174 

 Smoke nuisance, 120-121 

 Snow, cause of, 42 



measurement of, 399-400 

 Soap, I43-H5 



