G . INDEX. 



Ephoron Leukon or white jfiy of Passaick river, memoir on this insect, V, 



71. 

 Equations numeral, method of finding the root of, VI, 391. 

 Erica, deleterious qualities of the honey gathered from the different species 



of, V, 35. 

 Etymology, of certain English words, VI, 145. 

 Experiments, see Priestley. 



Falls, of the rivers of the U. S. considered as the anticnt boundary-line of 

 the Atlantic ocean, VI, 284. 



Felspar, contained in the gneiss of Maryland, VI, 321. — found in several 

 places in the primitive rocks of the U. S. 414. 



Ferrer, Jose 'Joaquin de, his observations on the eclipse of Jupiter's satel- 

 lites at Laguira, V, 189 his astronomical observations for determin- 

 ing the geographical position of various places in the U. S. and other 

 parts of N. A. VI, 158.- — 'his observations of the occultation of o 

 in Sagittarius by the disk of the moon, &c. 160.. — his observations 

 of the eclipse of the sun on Feb. 21st, 1803, 161. — his paper on 

 geographical positions without the boundary oi the U. S. 162. — his 



determination of the height of some mountains in New Spain, 164 



his memoir on the occultation, of Aldebaran by the moon &c. 213. 

 his geographical positions of sundry places in N. A. and in the 

 West Indies, 221. — his calculations on the passage of Mercury over 

 the disk of the sun, 226. — his observations made on the eclipse of 

 the sun, June 16th, 1806, 264, 293, 351, 362. — his observations on the 

 comet of 180" — 8, 345. — his continuation of astronomical observations 

 &c. 347. — his notes and corrections to be applied to the geographical 

 positions inserted from, 158 to 164, 360. 



Fibre, animal, experiments made with the nitrous acid, V, 5. 



Figure of the earth, observations on, V, 312. 



Fire place, descriptions of some improvements in, V, 320. 



Floridas, see Boundary. 



Fluids, analysis of those ejected before the black vomiting in yellow fever, 



V, 120. 



Fly Carrier, account of this insect, V, 150. 



Fortif cations, on the supposed of the western country, VI, 132. 



Fossils, found in the alluvial soil of Maryland, VI, 320. 



Frazer, John, his description of a stopper for the openings by which the 



sewers of cities receive the water of their drains, V, 148. 

 Freestone quarries, account of those on the Potomac and Rappahannoc river*, 



VI, 283. — situations and directions thereof, 285.— nature of the stone, 

 286. — component parts, 286. — colour, 288. — hardness, 288.. — specific 

 gravity. 28S. — mode of stratification, 288. — cause of this stratification 

 explained, 289. — difference of cohesion, 289. — quality of the stone as a 

 building material, 289. — substrata, 289, and superstrata, 290.— best quar- 

 ries now in work, 290. — manner of working the quarries, 291.— hypo- 

 thesis on the formation of, 291. 



Fuel, see Peak. 



