452 



INDEX. 



Numbers refer to Paragraphs. 



Color of bodies, 640. 

 Communicating vessels, 234. 

 Compass, 314. 



Compensating pendulum, 149. 

 Composition of forces, 80, 88. 

 Compound machines, 211. 

 Compressibility defined, 43. 

 Concave lens, 622, 626, 632. 

 Condensation of electricity, 351. 

 Condensers, 292, 352. 

 Conditions of matter, 53. 



44 " Changes of, 59. 



Conduction of electricity, 333. 



" heat, 538. 



Conjugate foci, 602, 625, 626. 

 Construction for images, 597, 605,608, 



628. 



Convection of heat, 541. 

 Convertibility of energy, 159. 

 Convex lens, 622-625, 627-631. 

 Critical angle, 617. 

 Culinary paradox, 505. 

 Curves, Magnetic, 313. 

 Cycloidal pendulum, 144. 



Daniell's battery, 381. 

 Declination, Magnetic, 319. 

 Density, Electric, 350. 

 Diamagnetic substances, 310. 

 Diathermancy, 552. 

 Dielectric machine, 347, 348. 

 Differential thermometer, 482, App. M. 

 Diffused light, 592. 

 Diffusion of heat, 537. 

 Dip, Magnetic, 318. 

 Dipping needle, 314, 318. 

 Direction, Line of, 65, 114. 

 Direction of bodies, Apparent, 594. 

 Discharger for electricity, 355, 371 (23). 

 Dispersion of light, 636. 

 Distillation, 511-513? ' * ^' 

 Distribution of electricity, 358, 359. 

 Divisibility defined, 41. 

 Divisions of matter, 3. 

 Double refraction, 673. 

 Double weighing, 177. 

 Downward pressure, 225, 226. 

 Ductility defined, 51. 

 Duration of electric spark, 364. 

 Dynamics defined, 63. 

 Dyne defined, 69. 



Ebullition, 501-510. 



Eccentric, 573. 



Echo, 442. 



Effects of electricity, 365-370, 388, 392, 



397, 402. 

 Elasticity, 45. 



Electric action, Law of, 329. 

 41 attraction, 323. 



bells, 371 (i). 

 u bomb, 371 (20). 

 " circuit, 376. 

 " chime, 371 (2). 

 44 condensers, 352. 

 u conductors, 333. 

 u current, 374, 375, 43-49- 

 u currents, Induced, 403. 

 u density or tension, 350. 

 " effects, 365-37. 3 88 > 392* 397. 



402. 



" experiments, 371. 

 u force, 325. 



44 fluids, Theory of, 335, 336. 

 44 induction, 337-3*0. 

 44 lamp, 389. 

 light, 653. 



" machines, 345-349- 

 44 orrery, 371 (n). 

 u repulsion, 324. 

 " resistance, 378. 

 " spark, 364, 371 (24), 411. 

 44 telegraph, 395. 

 44 tension, 350. 

 44 whirl, 371 (10). 

 Electricity and energy, 372. 

 44 Atmospheric, 360. 

 44 Condensation of, 351. 

 " Condenstrs of, 352. 

 4 Distribution of, 358, 359. 

 44 Kinds of, 326, 327, 328. 

 44 Tests for, 330, 331, 332. 

 44 Thermo-, 412. 

 44 Velocity of, 364. 

 44 Voltaic, 373. 

 Electrics, 334. 

 Electrodes, 377. 

 Electrolysis, 397^ 398. 

 Electrolyte, 397. 

 Electro-plating. 399. 

 Electrophorus, 342, 343. 

 Electroscope, 331, 332, App. K. 

 Electrotyping, 400. 



