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Fermentation, Eflay on, by Mr. Henry - - 273 



— T experiments on - - - 277, & feq. 



excited by Axed air - 279, & ieq. 



■ — — fafls relative to - - 287, & feq. 



, — \ theory of attempted - 289, & feq. 



Fixed Air, produces many effefts not by its acid, but its 



phiogiftic properties * - _ _ jp^ 



.= iis origin proves its phiogiftic nature - 199 



- confills of air, water, and phlogifton - 200 



why not totally foluble in water - 202 



. conftantly .and invariably confifts of the fame 



materials, in the fame proportions - - ^04 

 favourable to vegetation c - arn 



— — is the bafis of ferments - - 270 



Fiame, its appearance when refleiSied by coloured glafs 174 

 Ftoixiers, deprived of their colouring particles, and re- 

 duced to perfeft whiieaefs ' - - 186 

 . their colouring particles confift chiefly of in- 

 flammable matter, which they receive from the 

 rays of light - - _ . igg 

 f«^ of 1 783 - - -^ - 375 

 PoNTANA Able, breathed inflammable air - ro8 

 Franklin, Dr. his letter to Dr. Percival on the 

 quantities of rain in different places - - 126 



~ his meteorological imaginations and con- 



jtftures - - . . 2^2 



Frequency of crimes, increafes their political, but may 



lefitn their moral enormity - - jfS 



Fujiic, Mr. Delava l's experiments upon it - 177 



G. 



Genc'vaTis, plan of an academy far them in Ireland - 34 

 Glafs, knoivledge of the ancients concerning it - 95 



■ combined with gold — its colour, S:c. - 243 



does not reneiSl from its anterior, but from its 



inferior furface - - - 247 



Gregory, Dr. account of his life by Dr. Johnstonc 5jo 



— ■■-■ his works _ _ _ g^ 



Cum Arabic, ufed as fooJ - * J03 



M m ^ HALfs, 



