566 INDEX. 
Tranfit of Venus retarded by the aberration of light, p. 
358, 536. Quantity of this retardation, p. 539. 
Turpentine burnt in a glafs tube becomes a whitifh gioffy 
matter, p. 223. And ftrongly conducts electricity, p. 
224. Its exp!ofion luminous and like that palling 
through a thin furface of gilding, ibid. 
\ Twilight very bright in high latitudes, p. 113. 
V. 
Varnijh recommended for preferving birds, p. 412. 
Vegetation decreafs, the higher one afeends towards the 
top of mount Etna, p. 10. 
Vegni , Signor, his account of white marble formed by 
lome waters in Italy, p. 47. Ufe he made of it, p. 52. 
Venus , moments and phenomena of its contadls with the 
Sun in 1761 and 1769 deferibed by Mr. Dunn, p. 6. 
Venus , its laft tranfit over the Sun oblerved at Greenwich 
by Mr. Dunn, p. 65. At Dinapoor in the Ealt Indies, 
p. 239. And at Phefabad, p. 450. At and near 
Caen in Normandy, p. 259, 260. In the ifland of S. 
Domingo, p. 498, 499. At Ponoi in Lapland, p. 
364. At Cavan in Ireland, p. 462, 463. In Cali- 
fornia, p. 549, 551. 
Vefnvius and other mountains formed by explofion, p. 2, 
13. How diftinguilhed, ibid. 
W. 
Wales , Mr. William, Journal of his voyage to Churchill- 
river in Hudfon’s bay, p. too. His obfervations on 
the flate of the air, winds and weather, &c. p. 137. 
Water , diverfity of its pores alTumed, p. 326. Sinks 
immediately upon the folution of falts, p. 330, 331. 
Its fpecific gravity increafed by thefe folutions in a. de- 
creasing proportion, p. 343. 
Watfon , 
