Index 



667 



rabies, 454, 563 



radiant energy, 102, 151, 180, 234, 



572, 637 

 radiation, 101-103, 107, 109, 115, 



151, 637 

 radiator, 109-110, 113, 596, 637, 



(110) 



of automobile, 264-265 

 radio, 234-238, 277, 548, 549, 552, 



584, 637 



and aviation, 591, 592, (591) 

 and trans-Atlantic telephone, 



591-592 



frequency, 236 



receiving set, 235-238, 574, (235) 

 sending set, 234-235, 574, (234, 



237) 



waves, 181, 234-235, 587, 590, 592 

 radio beacons, 592, 637 

 radiometer, 18, 637, (18) 

 radium, 30, 570, 637 

 railroads, 259, 547, 601, 605, 607 

 railway locomotive, 18, 41, 259- 

 262, 266-267, (17, 259, 260, 267, 

 607) 

 rain, 46, 62, 68, 119, 121-122, 132, 



637 



rainbow, 182, 186-187, 637, (186) 

 rain clouds, 128-129, (128) 

 rainfall, 118, 121, 122, 126 

 distribution of, 125 

 effect on soil, 306 

 measurement of, 124 

 mountains and, 125 

 rain gauge, 124, 637, (124) 

 Ramsay, Sir W., 577 

 rats ; 466, 475, 539 

 rayon, 516, 637 

 rays, 102, 181, 183-184, 186, 187, 189, 



582, 637 



receiver, 221-222, 637, (221) 

 red corpuscles, 316, 340-341, 364, 

 394, 396, 416-417, 637, (316, 

 341) 



Reed, Dr. Walter, 543 

 reflection, 637, (184) 

 of heat, 115 



of light, 183-184, 187, (183) 

 of sound, 177-178, 586, 589 

 reflex action, 433, 637 

 reforestation, 93, 521, 637 



refraction of light, 185, 186, 187, 



637, (186) 

 refrigeration, 447, 553, 597, 638 



electric, 62, 229 

 register, 108 

 relative humidity, 111-112, 123, 



638 



t ble, 124 

 relativity, 573 



relay, telegraph, 220, 638, (220) 

 rennin, 402, 405, 638 

 reproduction, 638 



animals and man, 312, 320-321, 



322, 328 



plants, 312, 440, 492, 496-497 

 reservoir, 48, 51, 53, 54, 55, 60, 638, 



(55) 

 resistance, 38, 173, 212, 225, 231, 



232, 244, 605-608, 638 

 resistance coil, 231, 595 

 respiration, 638 



animals and man, 35, 312, 320, 

 322, 328, 332, 339-353, 422, 426, 

 493, 538 



artificial, 343-345, (344) 

 plants, 493-494, 499, 500-501, 538 

 respiratory system, 339-343, 347, 



(342) 



rest, 410, 435, 452 

 resuscitation, 343 

 retina, 187-188, 190, 589, 638, (188, 



189) 



retorts, 91, 92, 638 

 revolution, 638 



of earth, 119, 132, 134, 151-153, 



156, (149, 152) 

 of moon, 152, 153-155, (152) 

 ribs, 330-331, 340-341, 638, (331, 



340) 



rivers, 54, 67 

 roads, 255, 256-257, (256) 

 roasting, 370, 638 

 Rockefeller, 

 Institute, 474 

 Sanitary Commission, 466 

 rocks, 290-309, 638 

 and soil, 290-309 

 artificial, 296, (296) 

 formation of, 291 

 kinds of, 290-291 

 uses of, 293-297 

 Rontgen, 233 



