Index 



673 



variable condenser, 235-237, 644, 



(235) 

 veins, 644 



of body, 404, 416, 419-421, 425 



of leaf, 497, (498) 

 velocity, 131, 644 



ventilation, 41-43, 85, 111, 347-349, 

 467, 644 



meaning and importance of, 111- 

 113, 346, 467, 471 



methods of, 112-114, 348-349, 597- 

 601 



systems of, 112-113, 644-645 

 ventricles, 418, 645, (418) 

 Venus, 150, (149) 

 vermiform appendix, 401, 403, 645, 



(401) 

 vibrations, 645 



of a wire, 172-173, (173) 



producing sound, 170, 172-173, 

 175, 221-222, 234-236, (222) 



rate of, 22, 82 

 villi, 404, 645, (404) 

 Virchow, R., 578 

 virus, 456, 563, 645 

 vitamins, 355-356, 358, 364-365, 373, 



452, 645 



vocal cords, 174, 342, 347 

 voice, 174 

 volcano, 292, 645 

 volt, 211, 212, 645 

 Volta, 208, 209 

 voltage, 212, 225, 645 

 voltmeter, 212, 645 

 voluntary muscles, 331-332, 645 



W 



walking, 333, 347, 422 

 waning cf moon, 155 

 washing machines, 63, 226, 552-553 

 washing soda, 62 



wastes, 54, 58, 59, 339-340, 358, 412, 

 416, 417, 420, 421, 425-427, 469 

 water, 45-66, 90, 442, 499, 645 

 air in, 34, 37 

 and convection, 103, 109 

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



132 

 and soil, 49, 298-299, 305, 306, 



514-515 

 as a cleansing agent, 62-63 



water Cont'd 

 as a solvent, 31, 49, 51 

 boiling point of, 86-87 

 characteristics of, 31, 45, 49-51, 



88 

 composition of, 23, 24, 26, 30, 31, 



45, 46, 191, 358, (26) 

 cycle, 46, 68 

 distillation of, 61, (61) 

 distribution of, 31, 45, 46, 132 

 effects on climate, 47-48, 120 

 effects on crops, 48 

 electrolysis, 23, 45, 229, 623, (46) 

 energy of, 18-19, 67-68, 75 

 expansion of, 87-88 

 forms of, 14, 45 

 freezing of, 14, 45, 61, 86-88, 121, 



127, 300 

 hard, 62 



heating systems, 104-111 

 importance of, 315, 357-359, 427 

 in the body, 31, 45, 355, 358, 364, 



413, 427, 467 

 in the home, 51-54 

 power, 67-78, (69, 74) 



importance of, 68, 550 



sources of, 67-68, 69, 156 



uses of, 18, 68 

 pressure, 49, 50, 52, 58, 68-71, 75, 



276, (70, 71) 

 production of, 26 

 resistance, 605 

 softening of, 62 

 source of food supply, 48-49 

 temperature of, 46, 84 

 transportation, 49, 270-277, 286- 



289, 547-548, 602, 603, 605, 607, 



608, (27.7, 272, 274, 275) 

 uses of 48-49, 51, 59, 61, 62, 67, 



104, 109, 358, 448 

 vapor, 31, 34, 36-37, 46, 61, 68, 



118, 121-122, 125, 127, 137, 340, 



598, 645 

 waterfall, 13, 18, 67, 75, (13, 19, 72, 



74) 



water gas, 89, 92 

 water jacket, 264 

 water line, 274 

 waterspout, 119, 136-137, 645 

 water supply, 48, 51, 53, 54-57, 357- 



359, 467 

 of New York City, 54 



