U INDEX. 



T 



Talc, contained In the gneiss of Maryland, VI, 321. 



chloritit, in the primitive soil of Maryland, 322. 



Terraces, how constructed in India, VI, 380. — in the United States, 390. 



Thermometer, use of in navigation, V, 90. — mode of suspending and pro- 

 per situation of, VI, 10. 



Thermometrical observations, made at the confluence of the Mississippi and 

 Ohio rivers, V, 163. — made in measuring the boundary line between 

 the United States and the Floridas, 203.. — made during a voyage from 

 England to America, 96. 



Thomas, officer on board the American ship Ganges, his account of some new- 

 ly discovered islands and shoals, VI, 87. 



Timber, experiments made on the weight and strength of that used in Ben- 

 gal, VI, 382 use of in walls, 383. 



Time-piece, in the form of a globe, described, V, 82. 



Tin, action of the vapour of spirit of nitre on, V, 2. 



Tourmaline, found in the primitive soil of Maryland, VI, 322. 



Transit, of Mercury, May, 1799, observed by A. Ellicott, V, 197. 



Tripoli, a sort of clay, found in Maryland, VI, 320. 



Tumulus, articles found in an Indian, V, 74. 



Turner, George, his memoir on certain articles found in an Indian tumulus 

 at Cincinnati, V, 74. 



U 



United States, boundary between, and the Floridas, determined by astrono- 

 mical observations, V, 203. — See also Mac/ure. 



Vapour. See Priestley. 



Vaughan,John, his communication of observations made at Bowdoin Col- 

 lege, on the solar eclipse of 1806, VI, 275. — letter addressed to him 

 by professor Silliman and Mr. Kingsley, on the meteoric stones, 323. 

 . — extract of a letter relative to the great cold in January, 1807, at 

 Hallowell, Maine, 401. 



Vegetables. See Dupont. 



Velocity, on the comparative, of rivers at their bottom and their surface, 

 VI, 194. 



Venus, passage of, over the disk of the sun, VI, 352. 



Vera Cruz, New, longitude of, VI, 223, 361. 



Volcanic productions, no where found to the east of the Mississippi, VI, 414. 



Vomit, black, in the yellow fever, description of, V, 117. — appearance of, in 

 1797, 119. — fluids ejected before the commencement of, 120. — analysis 

 of, 121. — effects of on the living system, 128. — opinions of authors 

 concerning, 132. — considered by Dr. Cathrall as an altered secretion 

 from the bile, 136. 



