Analysis of Meteoric Iron from Tennessee. 355 
It turns out therefore, to be a portion of the mass described by 
Dr. Troost in Vol. xxxvin, p. 250, of this Journal. Having been 
presented by Dr. 'T’. with several fragments, as illustrative of the 
portion in his hands, I found on comparing them with the spe- 
cimen sent by President Easrersrook, that the latter differed very 
much from the former, in external appearance. Unlike to them, 
it was to a degree, free from the plumbaginous and pyritous ad- 
mixtures with which they abound. It agreed with them how- 
ever, in possessing a coarsely crystalline texture. Its proportion 
of nickel falls much below that quoted by Dr. Troost; but this 
is a circumstance which I have found to hold true in the Texas 
iron, wherein my experiments have proved the nickel to vary from 
3.2 to 9.6 percent. The specific gravity of the mass was 6.222. 
I. Ten grains were treated with nitro-hydrochloric acid. The 
metal was rapidly taken into solution; but a blackish residuum 
remained. This was treated by itself, with heated nitro-hydro- 
chloric acid for several hours. The quantity was thereby redu- 
ced ; but a few black grains (of the size of fine-grained gunpow- 
der) together with numerous shining scales, still remained in the 
fluid. These were well washed and dried. They weighed 0.01 
gr. The acid solutions were mingled, and precipitated by am- 
monia, in large excess. The fluid stood. along with the precipi- 
tate for six hours, at a teraperature of nearly 100°. The peroxide 
of iron was then separated, and thoroughly washed for several 
hours with tepid water. ‘The washings and the original ammo- 
niated liquor were mingled and boiled ; after which they were 
transferred to a glass bottle, and decomposed while hot by potassa. 
The clear liquid was separated after twenty four hours, by filter- 
ing (the hydrosulphate of ammonia, when added to it, produ- 
eed no change of color). The precipitated oxide of nickel was 
ignited, and weighed 0.6gr. ‘The peroxiderof iron after ignition, 
weighed 13.4 grs. We have then, v3 
Tron, - + - - 9.380 = 93.80 p. c. 
Nickel, - > - - 466= 4.66 p.c. 
Undissolved, - - - .010= 0.10 p.c. 
A second and parallel analysis was conducted upon 30 grs., the 
results of which were as follows: 
Peroxide of iron, 40.30=Iron, 28.210= 94.033 p. ¢. 
Protoxide of nickel, 1.68=Nickel, 1.333= 4.444 p. ¢.- 
Undissolved, 0.03=Undissolv’d, .030= 0.100 p. ec. 
