Vv Es 
Velocity of the Mississippi, vii, 174. 
of sound, vi, 394. 
Velocities, virtual, principle of, xlii, 
66; xliii, '77.£ 
Venetz, on boulders, xxxvi, 327. 
Venice bead manufactory, xxvii, 
78. 
Ventilating sewers, furnace for, vii, 
177. 
Ventilation, effect of, on the mor- 
tality of infants, xxvili, 79. 
Ventilator, marine, description of, 
S. Whiting, xviii, 75.f 
Ventriloquism, remarks 
Tolefree, xxvi, 76. 
Venus, appearances of, as seen at 
Rome, P. F. de Vico, xliv, 377. 
, results of observations on, 
P. F. de Vico, xliv, 383. 
, rotation of the planet, xxiv, 
204. 
Veratria, xxx, 190. 
Verd antique marble in Connecti- 
cut, ii, 165; vi, 38, 227. 
Vermiculite, 7. H. Webb, vii, 55. 
, the species objected to, C. 
Dewey, viii, 50. 
, I. H. Webb’s vindication, 
vill, 230. 
, in Maryland, xxiv, 356. 
Vermin, destruction of, by steam,| 
xvii, 390. 
Vermont, geological survey of, 
xlviil, 404. 
- Vernier, application of, to the sub- 
dividing of time, F. Osler, xliv, 
161. 
Vespertilio, see under Zootoey, 
Articulata. 
Vessels, best form for sailing, J: S. 
Russell, xxxv, 290. 
, propulsion of, by paddle- 
wheel and screw, xlii, 336. 
——, steam, see Steam. 
Vestiges of the Natural History of 
Creation, xlviii, 395; xlix, 191. 
Vesuvian, see Idocrase. 
Vesuvius, notice of, v, 193; vi,’ 
385 ; xill, 262 ; xxiv, 343; xxvii, 
281. 
R, 
on, 
VIR 
Vesuvius, connection of the Solfa- 
tara with, xix, 387. 
, eruption of, August, 1834, 
xxvill, 199. 
»—, April, 1835, xxviii, 
340. 
and the Solfatara, xlvii, 182. 
Vibrating dams, E. Loomis, xlv, 
363.f 
, time of vibration calcu- 
lated from the dimensions of, E. 
Loomis, xlv, 373. 
Vibration, effect of, on the colors of 
the light from different stars, x, 
188. 
of glass, movements in water 
produced by, xxx, 192. 
of railways, xxx, 382. 
of a mercurial pendulum, G. 
Baker, xlviii, 156. 
Vico, P. F. de, comet of, xviii, 402. 
Vienna, temple at, iv, 197. 
Vinci, L. da, on the motion of wa- 
ter, xIx, 397. 
Vines, diseases of, xxix, 367. 
, on the propagation of, xxvii, 
288. 
, to prevent the bleeding of, 
when cut, xxiv, 205. 
Vinegar, new process for obtaining 
from alcohol, xxviii, 359. 
, expeditious mode of manu- 
facturing, L. Feuchtwanger, xxxi, 
272.f 
, Impurities in, xix, 86. 
Vinification, treatise on, noticed, xi, 
396. 
Violan, xlii, 387. 
| Virginia meteorite, see Meteorites 
and Meteoric iron. 
|—— gold mines, see Gold. 
salt formation, xxiv, 51; xxix, 
84, 113; xli, 214; xliv, 173. 
, geological remarks on, i, 60, 
214, 317. 
tertiary formation, xi, 54; 
xxxvill, 183. 
, coal of, see under Coal. 
, geological report of W. B. 
Rogers, noticed, xxxii, 192; 
, mineralogy of, xii, 185. 
xxxvii, 380. 
