166 The Rev. Jonn Hóruz's Analysis of Satin Spar. 
6. A small piece of this substance, together with borax, being 
exposed to the flame of a candle, urged by the blow-pipe, and 
melted, the borax exhibited the presence of manganese by its 
purple colour. No iron could be detected in combination with - 
this oxide. Deducting, therefore, the 2.6875 grs. of the oxide of 
manganese from 56.25 grs., the remainder, viz. 53.5625 grs., will 
be the quantity of lime in 100 grs. of the substance analysed. . 
The following then, according to this analysis, are the propor- 
tions of the constituent parts in 100 grs. of pure satin spar, viz. 
Grs. 
lie . 2 3 l X 555625 
Black oxide of manganese = 2.6875 
Carbonic acid - - - - = 48.7500 
100 grs. 
After the great number of experiments which I have made on 
pure carbonate of lime, I have reason to conclude, that in 100 grs. 
of this substance, the lime = 55.9375 grs., and the carbonic acid 
= 44.0625 grs. Hence 100 grs. of pure satin spar contain — — 
Grs. 
Carbonate of lime - - - = 95.75 
Carbonate of manganese - = 4,25 
100 grs. 
St, Peter's College, Cambridge, 
March 12, 1812, 
X. Descrip- 
