Dime: seek eae i ays ap 8st sah) Set ap attecal ekg ed ee ace 1.322 
Magnesia. - +++ -sesssecenanes cece rene sevens trace 
Carbonic acid, (loss on ignition).+..++..+... 34.095 
99.730 
The rational composition is, perhaps: 
Silicate of Zine +s see e eee eee cece ee ee en eeee 2.748 
Carbonate of ZiInG: ssc esse ee eee ee tee eaee 94.925 
“ al hci ca ae Re ee Oe ee ae a eck ee oe a 2.360 
100.033 
which requires 34.398 per cent. of carbonic acid, instead of 34.095, as 
found. 
No. 57. Nitre earth; labeled “average nitre-earth, from J. T. Thomp- 
son’s nitre-cave on Cave creek, Newton county.” 
Time did not, at present, permit more than a qualitative examination 
of the watery extract of this earth. It was found to contain: 
A large amount of sulphate of lime; 
Nitric acid; 
Magnesia; 
Potassa; 
Chlorine, and a very small quantity of 
Phosphoric acid. 
As soon as circumstances allow, I shall report a complete analysis of 
this earth. 
