ELISHA MITCHELL SCIENTIFIC SOCIETY. 



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bling, siliceous, nearly decomposed ore ; 3=> Fairly compact, purplish 

 browii ; 4:° Compact, representing mass of ore; 5° Very compact, 

 showing crystalline structure; 6° Compact and siliceous; 7° Com- 

 pact and siliceous; 8° Very compact. As to magnetic properties, 

 1^ was not at all magnetic— 2, 3, and 4 very slightly so — 5, 6, and 7 

 rather more magnetic — 8 decidedly magnetic. The general charac- 

 ter of the ore is compact, crystalline with a slight action upon the 

 needle. Tests were made for titanium an^ chromium but none 

 found in the specimens examined. The solubility (relative) was 

 tested by putting a gram of each ore in a small loosely stoppered 

 flask, covering with 5 c.c. of hydrochloric acid (Sp. Gr. 1.15) and 

 heating on a sand-bath two hours. All were heated at the same 

 time, so the same temperature was maintained as nearly as possible. 

 As a rule, the methods recommended in Cairns^ Quantitative Analysis 

 were followed for the various determinations. In the colunm headed 

 *' Solubility,'' the figures show what percentage of the total amount 

 of iron present was dissolved. 



The figures for the percentage of silica were gotten by analysis 

 only in the case of Nos. 4 and 8, In the other cases they were got- 

 ten by difference, Nos, 5, 6 and 7, were determined only so far as 

 the iron was concerned, since they seemed merely siliceous varieties 

 of No. 4. In No. 8 the silica is probably a little high as the ore is 

 somewhat magnetic. The difiiculty of reaching exactly the same 

 <?onditions with this ore (No, 8) prevented a determination its rela- 

 tive solubility. 



Chemical Laboratory, U. N. C, February, 1884. 



