of Chromium with Iron. 347 
erill of this University, under whose instruction I have made 
the following examination of certain of them in the laboratory 
of the Lehigh University. 
The specimens analyzed consist of : 
1. Chrome iron ore from the neighborhood of Baltimore. 
2. A specimen of chromiferous cast iron obtained by the re- 
duction of 1. 
3. Turnings of No. 1 steel prepared by use of 2. 
1. The chrome ore possessed the ordinary character of the 
mineral, and analyzed by the method of Dr. Genth, gave the 
llowing percentage result : 
Silica 2°12 
Chromic oxyd 40°79 
Alumina 4°20 
Ferrous oxyd 44°48 
= Langa a d ‘ trace 
ime . B32 
Magnesia - - See Bet 
Phosphoric acid --- trace 
99°12 
2. The chromium cast iron is a very hard silver-white metal; 
apparently a mass of interlacing crystal needles. Hardness of 
feldspar, but very brittle and of density 7:25. It is attacked 
With great difficulty by the different acids and was brought 
Into solution for analysis by fusion with potassic bisulphate. 
a partial decomposition ensued ; the skeleton of carbon whic 
remained contained a good deal of undissolved and crystalline 
Am, Jour. Sc1.—Srconp Series, Vou. XLVIII, No. 144.—Nov., 1869. 
24 
