Wallerius, _b._ 319. Wallis, _a._ 276, 341, 343, 387, 395; _b._ 37. Walmesley, _a._ 440. Warburton, _a._ 427. Ward, Seth, _a._ 276, 396. Wargentin, _a._ 441. Watson, _b._ 195, 196, 202. Weber, Ernest and William, _b._ 43. Weiss, Prof., _b._ 326, 327. Wells, _b._ 170, 177, 242. Wenzel, _b._ 286. {32} Werner, _b._ 318, 337, 341, 514, 520, 521, 528, 584. Wheatstone, _b._ 44. Wheler, _b._ 379. Whewell, _a._ 459; _b._ 330. Whiston, _a._ 424. Wilcke, _b._ 161, 198, 204. Wilkins (Bishop), _a._ 275, 332, 395. William of Hirsaugen, _a._ 198. Willis, Rev. Robert, _a._ 246; _b._ 40, 47. Willis, Thomas, _b._ 462, 463, 465. Willoughby, _b._ 422, 423. Wolf, Caspar Frederick, _b._ 472. Wolff, _a._ 361; _b._ 165. Wollaston, _b._ 68, 70, 71, 81, 288, 325. Woodward, _b._ 508, 511, 584. Wren, _a._ 276, 343, 395; _b._ 421. Wright, _a._ 435. Xanthus, _b._ 360. Yates, _b._ 219. Young, Thomas, _a._ 350; _b._ 43, 92, &c., 111, 112. Zabarella, _a._ 235. Zach, _a._ 448. Ziegler, _b._ 174. Zimmerman, _b._ 557. {{33}} INDEX OF TECHNICAL TERMS. Aberration, _a._ 464. Absolute and relative, _a._ 69. Accelerating force, _a._ 326. Achromatism, _b._ 66. Acid, _b._ 263. Acoustics, _b._ 24. Acronycal rising and setting, _a._ 131. Action and reaction, _a._ 343. Acuation, _b._ 319. Acumination, _b._ 319. Acute harmonics, _b._ 37. Ætiology, _b._ 499. Affinity (in Chemistry), _b._ 265. " (in Natural History), _b._ 418. Agitation, Centre of, _a._ 357. Alidad, _a._ 184. Alineations, _a._ 158, 161. Alkali, _b._ 262. Almacantars, _a._ **181. Almagest, _a._ 170. Almanac, _a._ **181. Alphonsine tables, _a._ 178. Alternation (of formations), _b._ 538. Amphoteric silicides, _b._ 352. Analogy (in Natural History), _b._ 418. Analysis (chemical), _b._ 262. " (polar, of light), _b._ 80. Angle of cleavage, _b._ 322. " incidence, _b._ 53. " reflection, _b._ 53. Animal electricity, _b._ 238. Anïon, _b._ 298. Annus, _a._ 113. Anode, _b._ 298. Anomaly, _a._ 139, 141. Antarctic circle, _a._ 131. Antichthon, _a._ 82. Anticlinal line, _b._ 537. Antipodes, _a._ 196. Apogee, _a._ 146. Apotelesmatic astrology, _a._ 222. Apothecæ, _b._ 366. Appropriate ideas, _a._ 87. Arctic circle, _a._ 131. Armed magnets, _b._ 220. Armil, _a._ 163. Art and science, _a._ 239. Articulata, _b._ 478. Artificial magnets, _b._ 220. Ascendant, _a._ 222. Astrolabe, _a._ 164. Atmology, _b._ 137, 163. Atom, _a._ 78. Atomic theory, _b._ 285. Axes of symmetry (of crystals), _b._ 327. Axis (of a mountain chain), _b._ 537. Azimuth, _a._ **181. Azot, _b._ 276. Ballistics, _a._ 365. Bases (of salts), _b._264. Basset (of strata), _b._ 512. Beats, _b._ 29.