[ 2i6 ] 



portion of ingredients in felenite, when, as in this experiment, 

 Its ingredients are directly combined ; yet the proportion taken 

 from the quantity of precipitate is more fallacious, as will pre- 

 fently be Ihewn. 



In this diredl experiment the quantity of felenite obtained 

 after deficcation in a heat not exceeding 170*, amounted to 

 237,25 grains, of thefe 203,14 were lime and real acid; the re- 

 mainder then V : z 34, 1 1 were water ; then by the rule of pro- 

 portion 100 grains of this felenite fliould contain 14,38 of water, 

 confequently 85,62 were lime and acid. And if loo parts of fuch 

 compound contain 41,15 of lime, as already feen, 85,62 fhould 

 contain 35,23, and dedadling this from 85,62, we have 50,39 for 

 the acid part, confequently the centenary proportion of ingredi- 

 ents in felenite dried at about 165° is as follows : 



Real vitriolic acid - 5o>39 



Lime _ . - 55,23 



Water - - i4>38 



100,00 



If the felenite were dried by mere expofure to the air, the 

 quantity of water in 100 parts of the felenite would be greater, 

 and that of the lime and acid fmaller, and if it were ignited the 

 proportion of thefe laft would be greater, and that of the water 



fmaller, 



