C. M. Warren on Organic Elementary Analysis, 387 
the combined aid of chemical and mechanical means; and, be- 
sides the iron, I have been able to separate small but distinet 
ce of chromic iron, small spherical masses of olivine as 
eautiful in color and as transparent as that from the Pallas me- 
teoric iron, and also a pyroxenic mineral; and perhaps with a 
larger amount of material to work upon, other minerals might 
have been recognized. 
I have nothing to add to the careful chemical examination by 
Prof. Joy, having detached mechanicaily most of the minerals 
that he deduced from analysis. 
ArT. XL—On a Process of Organic Elementary Analysts, by 
Combustion in a Stream of Oxygen Gas; by C. M. WARREN.* 
capable of affording as accurate results, in a majority of in- 
Stances, as can, perhaps, be claimed for any other analytical pro- 
cess. Nevertheless, there are instances, and they are doubtless 
fruitless of good results, pure oxygen, as a combustion agent in 
analysis, would seem, of all substances, the one most naturally 
suggested. This apparent difficulty is probably the chief reason 
a, 
ges 
why it has not long ago been brought into general use; its 
* From the Proceedings of the Amer. Acad., Boston, March 8, 1864, vi, 251- 
