INDEX 



References to text are in Roman type. References to pictures, maps, 

 and diagrams are in italic type. 



absorption, 614 



animals and man, 312, 320, 322, 



328, 404, 405, 407-408 

 plants, 312, 494-496 

 accidents, 478 

 accommodation, 188, 614 

 acetylene, 25, 89, 92, 191, 614 

 acid, 63, 82, 208, 405, 614 



test for, 63, 357 

 adaptation, 325, 342, 404-419, 420, 



614 



adenoids, 346, 470, 615 

 adrenal glands, 423, 615 

 adulterants, 374, 615 

 aeration, 55-56, 615, (56) 

 aerial, 587, 589, 590, 615 

 agar-agar, 441, 615 

 Agassiz, L., 575 

 agriculture, 48, 76, 305, 551, 615 

 air, 34-44, 615 



as wind, 34, 47-48, 67, 119, 131- 



147, 646 



common uses of, 40-41, 43, 

 82, 278-286, 547, 570, 580, 606- 

 607 



composition of, 27, 31, 34-35 

 compressed, 41-43, 82, 262 

 currents, 34, 121, 122, 131-134 

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



598-601, 628 

 in soil, 34, 301 

 instruments, 39-40, 121, 138-139, 



(139} 



in water, 34, 37 

 nitrogen in, 27, 29, 31, 34-35, 36, 



301, 443 

 oxygen in, 23, 27, 29, 31, 34-35, 



36, 37, 301, (35) 

 pressure, 37-40, 119, 131, 132-139, 



282, 286, 581, (282) 

 properties of, 35-41, 103, (38) 

 relation to health, 37, 111, 122- 

 123, 315, 346-349, 422, 458-459, 

 465, 467, 472, 597-601, (467) 



air Cont'd 



resistance, 38, 173, 605-607 

 rusting of metals, 83, 301 

 sound in, 170-177, 221-222, 235- 



237 



supply, 347, 467 

 temperature of, 121, 122, 126, 131, 



596, 598, 599, 600 

 use in living things, 328, 339-345, 



347, 493, 499, 500-501 

 ventilation, 41-43, 111-113, 346, 



347-349, 467, 597-601 

 waves, 170, 234 

 where found, 34, 37, 301 

 air brake, 41, 262 

 air conditioning, 597-601, 615 

 in homes, 599-600 

 in schools, 599 

 in theaters, 598-599 

 air mail, 282, 548 



airplanes, 43, 279-289, 547, 570, 580, 

 591-593, 603, 605, 606-607, 615, 

 (281, 282, 283, 285, 286, 581, 

 606) 



air pump, 41, 170, 262, 615 

 air records, 279, 281, 283, 284, 285 

 air sac, 341-342, 615, (341) 

 airships, 279-280, 284, 547, 605, 615, 



(280) 



air transportation, 278-289, 547, 

 570, 580-582, 591-593, 603, 605, 

 (281, 282, 283, 285, 286, 581 t 

 606) 



albumen, 355, 615 

 albumin, 403, 405, 417, 615 

 albuminous food, 355 

 alcohol, 396, 615 

 as a fuel, 89, 91, 92 

 effects of use, 335-337, 346, 378, 

 380, 388, 392-397, 413, 424, 435, 

 436, 473, (394) 

 alimentary canal, 398, 401, 417, 615, 



(401) 



alkali, 63, 615 

 test for, 63, 357 



647 



