668 



Index 



Roosevelt Dam, 76, 305, (305) 

 root hairs, 304, 316, 443, 499, 524, 



638, (316) 

 roots, (444) 



of plants, 491, 494, 504-507, 511, 

 514, 638, (505, 507) 



of teeth, 400 

 rotary motor, 285, (285) 

 rotation, 638 



of crops, 307, 638 



of earth, 119, 132, 133, 134, 156, 

 159, 574 



of moon, 153 

 rubber, 87, 205 

 rudder, airplane, 285 

 Rumford, B. T., Count, 578 

 running, 333, 334, 421, (333) 

 rural sewage disposal, 59 

 rural water supply, 53 

 rust, 83, 301, 638 



saccharin, 374, 452, 638 



sailboat, 271-272, 276, (271, 272) 



saliva, 399-400, 405, 410, 638 



salivary glands, 399-400, 405, 423 



salt, 63, 638 



salting of foods, 445, 447 



sand, 301-302, 638 



sandstone, 291, 293-294, 638, (294) 



sanitation, 51, 54, 60, 461-462, 465, 



474, 544, 565, 601, 638 

 sap in plants, 51, 493 

 saprophytes, 440, 638 

 satellites, 150, 638, (149) 

 saturation point, 122 

 Saturn, 150, (149) 

 scalds, 479, 639 

 scanning disk, 588, (639) 

 scarlet fever, 471 

 Schaefer method, 343-345, 639, 



(344) 



Scheele, K. W., 578 

 Schick test, 460-461, 639 

 school hygiene, 470, 599, (461, 470) 

 Schulte, Max, 314 

 science, 639 



and progress, 546-554, 580-611 



branches of, 6 



defined, 6 



science Cont'd 



foundation of, 12-21 



meaning and importance of, 3- 



11, 546-554 



scientific method, 6, 639, (8) 

 scientist, how to become a, 6-9, 



555-579 



scientists, 7, 15, 22, 23, 39, 75, 106, 

 180, 200, 203, 204, 207, 208, 209, 

 215, 216, 218, 221, 232, 233, 234, 

 251, 259, 272, 275, 278, 281, 301, 

 313, 314, 379, 393, 449, 456, 469, 

 473, 474, 543, 546, 547, 548, 549, 

 551, 552, 555-579 



sclerotic coat, 187-188, 639, (188) 

 screen, television, 238, 589 

 screw, 243, 250, 586, 639, (250) 

 screw propeller, 272-273, 639 

 sea breezes, 47-48, 138 

 searchlights, 592-594, 639 

 seasons, 152 



causes of, 119, 156 



effects on plants, animals and 



man, 153 



secretions, 320, 322, 398, 399-400, 

 402-403, 405, 423, 434, 471, 496 

 sedimentary rocks, 290-291, 639 

 kinds of, 291 

 uses of, 293-295 

 seedling, 506, 639, (505, 507) 

 seeds, 493-494, 497, 504-513 

 semi-circular canal, 176, 639 

 sending key, telegraph, 219, 220, 



(220) 

 sensation, 639 



animals and man, 312, 319, 321, 



328, 330 



plants, 312, 493 

 senses, 330 

 sensory nerves, 432 

 septic tank, 59-60, 639, (59) 

 Sequoia trees, 523 

 serum, 347, 417, 457, 474, 475, 639 

 sewage disposal, 54, 58-60, 156, 465, 



469 



and plumbing, 60 

 and water supply, 54, 59 

 sewer gas, 60, 61 



trap, 60-61, (60) 

 sextant, 277, 548, 639 

 shadows, 182, 183, 639, (183) 

 shale, 291 



