32 Mr. woulfe’s Experiments on 
diftilled water, left a felenite, which when dried weighed 
7 ^ ij. and gr. xx. This proportion is greater than in the 
former experiment, which I attribute to the acid of vitriol 
having been dilated with water, and its combining on 
that account in a greater quantity with the calcareous 
earth of the fpar. The faline part by evaporation and 
cryftallizatien produced "ij. and gr. xxviii. of fait, com- 
pofed of fmall long cryftals, like Epfom lalts; it taile was 
bitter and ftyptic. 
This fpar, in its natural ftate, effervefces ftrongly with 
redtified acid of fait, produces heat, and totally dilfolves 
in it; the folution is of a fine yellow colour. 
Redtified acid of nitre diffolves alfo this fpar with 
effervefcence and heat ; but the folution is colourlefs. 
I judged from the foregoing experiments that this' 
fpar was compofed of calcareous earth, fome iron, and 
a portion of fome other earth, which, with acid of vitriol, 
forms a foluble fait. 
EXPERIMENT III. 
In order to determine the quantity of calcareous earth 
this fpar contained, I diflolved three drams of it in redti- 
fied add of fait, and by the addition of a fufficient quan- 
tity of a folution of tartar of vitriol in water, I obtained 
a felenite, 
