480 



INDEX. 



periodic, 63 ; integrated, 67 ; elliptic, 

 94; simple proportional, 127. 



Vegetables and animals, ii. 396. 



Vertebrata, ii. 373. 



Vibrations, isochronous, i. 344; prin- 

 ciple of forced, ii. 65; analogy to 

 nerve influence, ii. 287. 



Vital force, ii. 155. 



Voltaire, ii. 327. 



Vortices, theory of, ii. 142, 146. 



W. 



Wallis, i. 143; parallax of stars, 393. 



Water, properties of, ii. 261. 



Watts' parallel motion, ii. 79. 



Waves, ii. 155, 333; experiments on, 

 i. 340; theory of, ii. 170, 248. 



Weighted observations, i. 449. 



Wells, on dew, ii. 34. 



Wenzel, on neutral salts, i. 344. 



Wheatstone, i. 143 ; ii. 53 ; galvano- 

 meter, i. 333 ; rotating mirror, 349 ; 

 electric sparks, 360 ; kaleidophone, 

 ii. 58. 



Whewell, on tides, i. 432; ii. 178; 

 method of least squares, i. 448. 



Whitworth, Sir. J., system of screws, i. 

 25 ; measurement of length, 356 ; ii. 



Wilbraham, on Boole's method, i. 235. 



Williamson. A. W., on subsidiary units, 

 i- 374J prediction in organic chem- 

 istry, ii. 181. 



Wollaston, goniometer, i. 334 ; sun- 

 Jight, 352 ; spectrum, ii. 38. 



X. 



X, the substance, ii. 155. 



Y. 



Yard, standard, i. 463. 



Young, on Diodorus Siculus, i. 284; 

 connexion of languages, 285 ; tension 

 of aqueous vapour, ii. 126; use of 

 hypothesis, 136; ethereal medium, 

 145. 



Z. 



Zodiacal light, i. 321. 

 Zoology, ii. 335. 



(ll 



OXFORD: 



BY E. B. GARDNER, E. PICKARD HALL, AND J. H. STACY, 

 PRINTERS TO THE UNIVERSITY. 



