440 INDEX. 



ToaUo on figns of change of weather, 357. 



on the fog of 1783, &c. 417. 



Tornado, a phenomenon of this kind in Berwickfhitc, Ji^, 



7ranfmutat'wn of metals, remarks upon, 1 8. 



Travels through Turkey, E^ypt, Syria, &c. 6, 239, 405, 



Tree, account of a large one, 119 



Turnfol bluti method of preparing, ijf. 



Urantte, query refpedting the analyfiS of, 112, 



Vaccine inoculation, co'^munication from Dr. Pearfon on, 3!?, 



Variolous matter, le ter from Dr. J. C. Smyth on, 103. 



Varhy on the magnifying power of telefcopes, 87. 



Vegetal},- V:fc, effects of mercury on, 161. 



Vegetable juices, experiments on the colouring matter of, 81. 



Veiiui, on the licight of the mountains of, 393, 



Verdigrife cryjlallii-ed, method of manufa6turing, lyi. 



Vcrdigrife, on the manufafture of, 'ix. 



Voigt on the vibration nodes of mufical ftring?, 347, 



Vclatilc alkali, a cure for the bite of fnakes, 192. 



Volta, poftfcript to his letter on galvanifm, 306, 



■ on animal cleftricity, 59. 



War, the influence of on the atmofphere, &c. 33 3t 

 Weather, on figns which indicate changes of, 367. 

 IVhite-iuaJJ/tng, a new fize for the pnrpofe of, 335. 

 Whjte'z thoughts on deafnefs, and help for, 378. 

 ^i///a»»^ on the cure of pcrfons bitten by fnakes, 191. 

 Windmills, on the form of the vanes of, 174. 

 Weod, an experiment on the growth of, 197. 

 Wool, to know when adulterated with cotton, 217, 



Zini, Bindheim on the ores of, 251. 



JES'D OP THE FOURTH VOLUME. 



LO ND ON: 



JRIN'TED BY J. DAVIS, CH/iNCERy-tASr 

 W.DCC.XCJIX, 



