184 Dr. Mallet’s Analyses, &. 
Combined silica, - 39°75 ‘877 1:2 
_Free silica, - - - 485 «6 
Alumina, - - - 38°92 757 # 
Peroxyd of iron, : ‘78 
Lime, potash, &c., 1:03 
Water, - . - - 13°38 1487 2 
Undecomposed mineral, “90 
99°61 
The second, from Randolph Co., yielded 
Atoms. 
Combined silica, - 19°85 ‘438 i 
Free silica, - - - 17-44 
lumina, - 
Peroxydofiron, - - trace 
Potash, lime, and magnesia, -°72 - 
ater, - - - 15:09 1676 838. 
1498 (of which 7°49 = finely 
divided quartz.) 
Undecomposed mineral, 
99°30 
amount of titanium. It was a specimen of magnetic iron from 
near Oak Bowery; sp. gr.=4827. It was decomposed by fusion 
Ided 
eroxyd iron, : 61°37 
* { Sesquioxyd of titanium, - - =), Wa. 
Protoxyd of iron, - : “ei exc? baeeo 
Magnesia, : - - - engi. * 08 
lumi - - - te trace 
Silica, - - + - - - - D4 
