384 INDEX. 



Trees^ antiquity of, 166 



Tubes, on the substitution of, for bottles, in the preservation of 

 certain fluids, 149, 150 



Ulmin, gallic acid converted into, by oxygen gas, 353 



Ure{I>T. A.) letter of, on Job Rider's rotatory steam-engine, 142 



Fopowr, increased production of, 148 



Variation^ annual, of some of>ifie principal fixed stars, S78 

 Vauquelin (M.) experiments, ^c, of, on a destructible green mat- 

 ter, the produce of a mineral water, 358-360 

 Velocity of sound in Holland, experiments on, 108 

 VisioHf singular imperfection in, 368 



Volcano of Etna, account of the eruption of, in 1819, 227-234 

 Voltaic pile and current, observations on, 337, 338 ; apparatus for 

 ^ exhibiting the simultaneous rotation of two voltaic conducting 

 wires round the opposite poles of magnets, 336 



Watery maximum of the density of, 149 



Weaver^ (Thomas, Esq.) description by, of the fossil elk of Ireland, 

 269 



Wedge, observations on the theory of, 234-236 



Werner's fProfessor) theory of the earth, sketch of, 72-74 



Whewell (Rev. W.) abstract of his general method of calculating 

 the angles made by any planes of crystals, and the laws accord- 

 ing to which they are formed, S96-298 



Whiskey, Si preservative of anatomical preparations, 368,369 



Whitehurst's (John) theory of the earth, notice of, 70 



Wine, oil of, production and nature of, 96-98 



Wire, iron, drawing of, facilitated, 135 



Wohler (M.) experiments of, on a compound of cyanuret and nitrate 

 of silver, 159-161 



Wood, new method of em bossing on, 134, 135 



Woodhouse (Robert, Esq.) account of the transit instrument put up 

 at Cambridge observatory, 268 



Woodward's (Dr.) theory of the earth, account of, 67, 68 



Zoological Society, prospectus and plan of, 369-372 



London ; f»pirffceti>W ^rW'l^iA^/S, Northumberland-Con rt. 



