INDEX. 



Thomas de Thomon, 302 



Thomson's experiments on Fluids, 134. 



239 

 Thornhill, Mr. 61 

 T. I. B. on the maximum denfity of 



water, i3o 

 Toulmin, Mr. oh the &Ppofcd Welch 



tribe of American Indians, 1S1 

 {Trades, objectionable, on account of their 



pernicious quali ies, 123 

 Trail, Dr* on the conducting power of 



fluids, 133 

 Traveller, a, on the ftate of provincial 



focieties for fcientific and literary im- 

 provement j 267 

 Trees, on the ftate in which their fap is 



depefiteri during winder, 233 

 Trevithick's fteam-engines, 1 

 Tromfdorf, M. on obtaining pure cobalt, 



258 

 Trufler, Dr. on heavinefs and weight, 



Tungftein, falfe, 105 

 Turf, obfervations on, 364 



V. 



Valli, Dr. on the prevention of putrefac- 

 tion., 144 



Vapour, aqueous, applied to the refining 

 of iron, 37 



Varnifh capable of refilling the actions of 

 acids en metals, procefs for making, 

 207 



Vaucher, M. on the feiches of the lake 

 of Geneva, 198 



Vauquelin on cerite, 105, ic8.— On 

 gum-arabic and adracanth, 256 



Vefuvius, eruption of, 222 



Vegetable fubftance, a new, 97 



Vibrations of a balance, on the, 56 



Vieta, 225 



Vinegar manufactories, 127 



Von Einfiedcl, 35 



W. 



Wagener's invention for printing charts, 



Wajlis, 225 



THE END OF THf 



Printed by W, Stratford, 



Water, apparatus for raifmg, by rhearis c?~ 

 condeufed air, 16.— Reiuatkson Count 

 Rumford's experiments on the denfity 

 of, 28, 180, 339. — How far ufsful in 



refining of iron, 37 Abforption of 



in fails, 85. — A bad conductor of heat, 

 1 62. — Effect produced on by air blown 

 from the human lungs, at tiie depth of 

 fcveral feet below the furface, 206.-— 

 Formation of by comprefiion, 21a 



Water-blowing machines, 48. -—Experi- 

 ments with 50. — General conclusions, 

 54 



Water-clocks, 363 



Water colours, experiment* in, 208 



Weight and heavinefs, not fynoniraous 

 terms, 14 



Welch Indians of North America, ob- 

 fervations and conjectures relative to, 

 181 



Welter's apparatus for obtaining carbonate 

 of potalh too complicated, 274 



White colour, new definicion of, n 



Williams, Dr. 190 



W. N. on the burfting of mufquet bar- 

 rels by a charge of gun powder con- 

 fined with find, 40. — On the invifible 

 emirlion of fleam into the air, 47.— 

 On vater- blowing machines, 54. — On, 

 t* .eiches of the Lake of Geneva, 203. 

 — In anfwer to F. A. on improved 

 thermometers, 217. — On the contrac- 



• ticn of water by hear, 362 



Wood, on the art of hendi'iP?, 30 



felled in autumn or winter more firm 



than when fuffered to ftand till fpring 

 or fummer: correction of the general 

 opinion as to the caufc, 233 



Woolf, Mr. his improvements in fleam- 

 engines, 294, 316 



Wright Elizur, his newly conflructed, 

 air pump, 305 



Wyatt, Mr. Samuel, 338 



Y. 



Young, Mr. Charles, on the vibration* 

 of a balance, 56.— On the analyfis 'of 



foils, 81 



TWELFTH VOLUME. 



Crown-Court, Templs-Bar, 



