INDEX 



313 



Pudding stones, 180 

 Pulley, 59, 60 * 

 Pumps, 103 



air, 99 *, 100 * 



force, 104 *, 105 



lift, 103, 104 * 



suction, 103 



Quarry, 178 *, 180 *, 181 * 

 Quartz, 168 *, 170 



Radiation of heat, 75 

 Reduction of ores, 168, 169 * 

 Reducing agents, 168 

 Reflection of light, 121, 122 * 

 Refracting bodies, 123 

 Refraction of light, 121, 123 *, 124 * 

 Regulus, 16, 19, 33 

 Relief maps, 216, 217 * 

 Reproduction, 54, 254 



object, 276 



of animals, 298 



of cells, 264 



of plants, 276 

 Reproductive organs, of animals, 298 



of plants, 276 

 Reservoirs, 221, 250, 251 * 

 Respiration, 256 



of animals, 302 



of plants, 273 

 Resultant, 56 

 Retina, 125 

 Rivers, absence, 241 



deposit, 238 



erosion, 237 



formation, 235 



load, 236 



usefulness, 240 

 Rocks, 177 



folded, 182, 185 *, 204 * 



igneous, 178 * 



making, 177, 186 



metamorphic, 182 



sedimentary, 179, 180 *, 181 * 



value, 184 



water- worn, 177 * 



weathered, 234 * 

 Roots, 265 



extent, 265 



functions, 265 



primary, 265, 266 * 



secondary, 265, 266 * 



Roots, uses, 266 



Salt lakes, 84 

 Salts, 161 



uses, 162 

 Sandstone, 180 



quarry, 180 * 



Saturn, 33, 34, 35 *, 36, 37, 38 * 

 Scales, platform, 64 * 

 Schist, 182 

 Scorpio, 15 *, 16, 21 

 Screw, 59, 60 * 

 Seasons, 24 



Sedimentary rock, 179, 180 * 

 Seed pods, 279 * 

 Seed, 278 



bean, 278 



germination, 279 



Sensation, relation to motion, 293 

 Sense organs, 291 



of a fish, 292 

 Sensitive plant, 286 * 

 Sensory nerve, 291 

 Sepals, 276, 277 * 

 Sex, 298 

 Shales, 181 

 Sickle, 16 



Silliman, Benjamin, 159 * 

 Silver, 154 



Silver plating bath, 163 * 

 Siphon, 102* 

 Sirius, 16, 19 

 Slag, 169 

 Snow line, 244 

 Soda water, 94 

 Soil, 234 

 Solar system, 22 

 Solids, definition, 67 

 Solution', 82 

 Solvents, 83 

 Specific gravity, 66 



of metals, 155 

 Spontaneous, combustion, 140 



motion, 54, 254 

 Spores, 281 

 Springs, 86 



fissure, 85, 86 * 



mineral, 84 



surface, 236 * 

 Stalactites, 173 * 

 Stalagmites, 173 * 

 Stamens, 276 



