460 J. W. Mallet-—Inmonite with the color of Gothite. 
the stony meteorites as to their gaseous contents, as in the for- 
mer the hydrogen is most abundant, while in ‘the latter the 
oxides of carbon are the characteristic constituents. 
e spectrum of the gases, at a few millimeters AeereleBé. 
meteoric character of these bodies. A more extended and par- 
ticular account of the investigation will be given in the next 
number of this Journal. 
Yale College, May 22, 1875. 
Art. LIII.— On Limonite with the Color and Translucency of 
Gothite ; by Prof. J. W. MAuuet, Univ. of Virginia. 
THE specimen which is the subject of this notice was received 
with other minerals from Capt. F. M. Imboden, of Richmond, 
Va., having come from the land of Dr. F. H. Griffin, near Big 
Lick, Roanoke Co., Va. 
Passing through ordinary compact limonite there were veins 
of a quarter to half an inch in thickness, distinctly translucent 
on the edges of splinters, and having a deep lor 
by transmitted light—by reflected light nearly black, with a 
luster between adamantine and resinous. Streak yellowish 
brown. Massive, with no traces of crystalline or oe struc- 
H° C. 
ture. Hardness a little over 5. Sp. gr =38-76 at 1 
Analysis gave 
BO ee OA ee oe ares 
Be ee Se a ee 
BEG A ir che ees in oo) 26 
ee ee Cas Bere oat 2°38 
Bc cde eligi 51 
Laure) Any Sesto wee iege) 14-95 =99°73 
The inca was lost at the following rate with increasing 
tempera 
At 100° C. (for: three hours), - Cer ES 70 Pp. ©. 
BO ON ee ee 
“ 200° a ee Ce sae “ 
« 950° “ce “ erring sat 5-01 “ 
waved Nest 9 Gk ee 3°74 = 14°95 p.c. 
If 2°68 p.c. of Fe,O, be deducted as combined with the 
2°38 of P,O, to form ferric ortho-phosphate (FePO,), and the 
