INDEX. 



galvanifm on, 179. — Cannot be made to 

 boil in a fpoon blackened with the fmoke, 

 ao2. — Is not heated in the flame of a 

 candle, 203.— A cylindrical pit of, in a 

 mafs of ice, 207. — Experiments on its 

 decompofition by different galvanic ar- 

 rangements, 243,— ^ompofition of a 

 liquor for rendering fluffs impermeable 

 to, 25a 



Watt, Mr. 45,48, 215 



Weather, moft favourable for the labour 

 of bees, 187 



Wedgewood, Mr. 99 



Werner, 30 



Wheel kept in perpetual motion by a ma- 

 rine barometer, 212 



Wheel carriages, defcription of an appara- 

 tus for locking, 177 



Wilkinfon, C. Efq. on galvanifm and elec- 

 tricity, 175.— On the laws of galva- 

 nifm, 240 



Willis, Mr. T. on the mucilaginous matter 

 of certain vegetables and their ufe as a 

 fubflitute for gum Arabic, 232 



Wilfon, Rev. J. on fome uncommon cf- 



fefts of lightning, i 

 Mr. W. defcription and drawing 



of his compound eledtrical condenfer and 



doublcr, 19 

 Winter fleep of animals, prize queflion re- 



fpe£ting, 141 

 W. N. on fairy rings, 4. — On the power 



of a firil mover, 278 (note). 

 Wollafton, Dr. 139, 140, 176 



Young, Dr. his experiments and calcula- 

 tions relative to phyfical optics, 63, 130. 

 ^-On a new moving flar, 112.— On the 

 maximum of denfity in water, ib.— Oa 

 the elafticity of bodies, 113. — Remarks 

 on the colours of natural bodies, 139 



Z. 



Zinc, fufpenfion of in hidrogcn, 24.- 

 On the latent heat of, 45. 



END OF THE NINTH VOLUME. 



ERRATUM. 

 In Plate XII. Fig, 3, by an omiflion in the defign, the lower ruler has not the fame 

 connexion with the frame as the upper. It mufl be joined by prolonging the rod from 

 the left hand angle, and adding a rod from thence to the bar upon the ruler j as is feen 

 above. 



Printed by W. Stratford, Crown-Court,^ Temple-Bar. 



