

NUMBERS REFER TO PARAGRAPHS 



Aberration, Chromatic, 646. 



Spherical, 633. 

 Absolute pitch of sound, 459. 



" unit of force, 68. 

 Absorption and radiation of heat and 



light, 654, 655. 

 Absorption of heat, 553, 

 Achromatic lens, 647. 

 Acoustic tubes, 433. 

 Actinic spectrum, 651, 652. 

 Adhesion defined, 46. 

 Aerial ocean, 271. 

 Agriform body defined, 57, 61. 

 Affinity, Chemical, 568. 

 Air-chamber, 297. 

 Air-pump, 288-293. 

 Air, weight of, 272. 

 Amalgamating zincs, 386. 

 Amplitude of vibration, 140, 419, 431. 

 Aneroid barometer, 280. 

 Angle of incidence, 97. 

 Apparent direction of bodies, 594. 

 Archimedes' principle, 238, 239. 

 Armatures for magnets, 321. 

 Artificial magnet, 303. 

 Ascending bodies, 132. 

 Astatic needle, 314. 

 Astronomical telescope, 66 1. 

 Athermanous, 552. 

 Atmospheric electricity, 350. 



pressure, 273, 275, 277, 



App. H. 

 Atom defined, 6. 

 Attraction, Capillary, 235. 



" Electric, 323. 



" Forms of, 7. 



" Magnetic, 305, 306. 

 Attwood, 122. 



B 



Balance, 175. 

 Balance, False, 176. 



Balloons, App. G. ( . , 



Barker's mill, 264, App. F. 

 Barometer, 274, 278, 279, 280. 

 Baroscope, 281. 

 Battery, Leyden, 357. 



u Voltaic, 379-385. 

 Beam of light, 583. 

 Beats, 452, 453. 

 Beaume's hydrometer, 252. 

 Bellows, Hydrostatic, 222. 

 Bent levers, 173. 



Bi-chromate of potassium battery, 383^ 

 Boiling-point, 479, 501-510. 

 Breast wheel, 262. 

 Brittleness defined, 49. 

 Broken magnets, 307. 

 Bunsen's air-pump, 291. 



" battery, 385. 



C 



Calorific powers, 569. 

 Calorimeter, 531. 



Camera, The photographer's, 656. 

 Capillary attraction, 235. 



phenomena, 236. 

 Cathetal prism, 621 (c). 

 Centrifugal force, 74, App. C. 

 C. G. S. units, 69, 154. 

 Changes, Chemical, n. 



Physical, 10. 



of condition of matter, 59. 

 Characteristic properties, 19, 21. 

 Charging by induction, 339, 340. 

 Chemical affinity, 568. 



changes, n. 



" effects of electricity, 368, 397. 

 " properties, 15. 

 Chromatic aberration, 646. 

 Chromatics, 634. 

 Clarionet, 471. 

 Clouds, Electrified, 361. 

 Cohesion defined, 46. 

 Coincident waves, 448. 



