Index 



659 



heat Cont'd 

 water and, 14, 18, 46, 47, 87-88, 



132 



waves, 180-181, 190 

 zones of, 119-120 

 heating of land and water, 47-48 

 heating systems, 104-111, 594-596, 



627, (108, 110) 

 heavenly bodies, 148-155 

 heavens, 148-155, 627 

 distance in, 165, (165) 

 seasons, 152, 153, 156 

 solar system 148-155, 640, 



(149) 

 stars and constellations, 148, 



150, 161-165 



helium, 30, 232, 278, 627 

 helix, 216, 627 



Helmholtz, H. L. F. von, 576 

 hemoglobin, 341, 417, 627 

 hemorrhage, 482-483, 627 

 Henry, Joseph, 216, 560-561, 576, 



(560) 



heroin, 385-386, 627 

 Herschel, Sir J. F. W., 576 

 Hertz, 234 



hertzian waves, 234-235, 627 

 hibernation, 153, 627 

 high pressure area, 131, 132, 133, 



135, 140 



highs, 144-145, 627, (144) 

 hilum, 505-508, 627 

 Holland, John, 275 

 Hooke, Robert, 314 

 hookworm, 466 

 hormones, 423, 627 

 horse latitudes, 132, 133, 134, 628, 



(133) 



horse power, 75, 243, 628 

 hot air furnace, 104, 107-108, 111, 



595, 627, (108) 

 hot water heater, 104, 109-111, 112, 



595, 627, (110) 

 hot waves, 140 



house flies, 459, 543-544, (459) 

 houses, heating of, 104-111 

 hull, 274, 276 

 human body, 328-338 



aids to, 176-177, 189-190, 330, 332- 



335, 409-415 



as an engine, 19, 35, 328, 339, 

 354, 361-366, 398, 409, 416 



human body Cont'd 

 care of, 328, 330, 332-335, 346 



410, 435, 451-464, 465-477 

 efficiency of, 332-335, 465-476 

 handicaps to, 176-177, 189-190, 

 330, 354, 377-391, 392-395, 409- 

 415, 452, 465-475 



structure and functions, 175-176, 

 187-188, 315, 324-325, 328-332, 

 335, 339-353, 398-408, 416-429, 

 430-438, (330, 331) 

 temperature of, 87, 349 

 uses of food in, 19, 361-366, 372, 



398, 416 

 humidifier, 108, 349, 598, 600, 



628 



humidistat, 600, 628 

 humidity, 111-112, 121-124, 126, 



598-601, 628 



humus, 301, 306, 514, 628 

 hurricane, 119, 131, 135, 136, 628, 



(135) 



Huxley, T. H., 313, 576 

 Huygens, Christian, 180 

 hydro-airplane, 285, 628, (286) 

 hydrocarbon, 91-92, 628 

 hydrogen, 30, 89, 90, 93, 151, 313, 



355, 628 

 in water, 23, 24, 26, 29, 31, 45-46, 



191 



preparation of, 24-26, 82, (26) 

 properties of, 24-25, 29 

 uses of, 24, 29, 278 

 hydrophobia, 454, 562-563 

 hygiene, 628 

 industrial, 465, 470 

 of body, 328, 330, 332-335, 346, 



410, 435, 451-464, 465-477 

 of circulation, 422-423 

 of ears, 176-177 

 of excretion, 412-413, 427 

 of eyes, 189-190 

 of mouth, 411-412 

 of nervous system, 434-435 

 of nose, 471 

 of skin, 427 

 of throat, 471 

 school, 470, 599, (461, 470) 

 hygrometer, 123-124, 628, (123) 

 hypocotyl, 504-508, 628, (504, 505, 



507) 

 hypothesis, 7, 83, 628 



