INDEX 



An asterisk (*) indicates use of one or more illustrations in connection with refer- 

 ence to which appended. 



Acetylene, carbon and hydrogen in, 



315- 



Acids, 351 ff. ; action of, on metals, 

 351-353*; action of, on cloth, 354*; 

 action pf, on nerves of taste, 354-355 ; 

 distinguished from bases by litmus 

 test, 358-359; neutralization of, 

 by bases, 360-364. 



Action and reaction, law of, 77-81*. 



Adhesion, 39, 41-44; cohesion, capil- 

 lary attraction, and, 47. 



Air, cooling of, on expanding, 95-96; 

 liquid, 97 ; heat carried by, by con- 

 vection, 118-119; absorption of 

 light by, 169; sound produced by 

 vibrations of, 174-181*; pitch due 

 to rapidity of vibrations of, 186; 

 water vapor in, 275-280*; a mix- 

 ture and not a compound, 309; 

 part taken by, in making automobile 

 go, 344; limewater test for carbon 

 dioxid in, 375. 



Air pressure, 10 ff., 14*; height water 

 is forced up by, in vacuum, 19; 

 high and low, 20, 282 ; winds caused 

 by, 20-21. 



Air pump, 14*, 15. 



Alcohol, boiling of, 112; distilling, 

 ii3*-H4. 



Alkali, 356; in soap, 357~358. 



Alloys, definition of, 310. 



Alternating current, denned, 211-212. 



Alum crystals, experiment with, 265- 

 266*. 



Aluminum, an element, 299. 



Alum in water, testing with litmus 

 paper, 359. 



Amber, electricity produced by rub- 

 bing with silk, 196. 



Ammonia, example of a common base, 

 356; action of, in cleaning cloth, 

 358; litmus test of, 359; neutrali- 

 zation of acid by, 363. 



Ampere, denned, 246. 



Analysis, chemical, 370-376. 



Aneroid barometer, 285*. 



Arc, the electric, 233-240*. 



Atoms, description of, 196; electrons 

 and, 197; everything in the world 

 made of, 310-311; in molecules 

 3ii- 



Aurora Borealis, cause of, 193. 



Automobile, reason for cranking, 210; 

 how made to go, 344-345. 



Automobile races, overcoming of 

 centrifugal force in, 75*. 



Automobile tires, reason for wearing 

 of, 80 ; blow-outs of, 348. 



Baking powder, chemical change 

 by solution shown by, 349-350; 

 elements of which made, 367- 

 368. 



Baking soda, a common base, 356; 

 testing with litmus paper, 359; 

 neutralization of sour milk by, in 

 cooking, 362 ; carbon dioxid in, 366- 

 367- 



Ball bearings, used to diminish fric- 

 tion, 54-55. 



Balloon, expansion of, 17-18, 109*; 

 reason for rising of, 26; filling of, 

 with hydrogen, 301-304*. 



Barometer, use of, 280-285*. 



Bases, substances called, 355-358; 

 litmus test for distinguishing from 

 acids, 358-359; neutralization of, 

 by acids, 360-364. 



Batteries, electric, 203-205*; different 

 kinds of, 2O5*-207*; general prin- 

 ciple of all, 206. 



Bell, electric battery for ringing, 204 

 205*; working of electric, 255*. 



Bending of light (refraction), 136- 

 141* 



Black, the absence of light, 164. 



Bleaching, process of, 326-327. 



Blow-out of tire, a real explosion, 348. 



Blue-flame heaters, 319. 



Blueness of sky, reason for, 169. 



Blueprints, making of, 330-331. 



Boiling and condensing, 107-115* 



Borax bead test, 37i*~372*. 



Brass, an alloy, 310. 



383 



