Notice of Prof. Clark’s Thesis on Metallic Meteorites. 15 
have been chrysolite; though perhaps only quartz mixed with 
21. Agram, (Hraschina) Croatia. This most interesting mete- 
orite, which fell May 26, 1751, and for nearly 100 years was the 
only one of the metallic class positively known to have fallen 
from the heavens, was first seen asa brilliant fire-ball passing 
from west to east through a cloudless sky at 6 p.m, attended 
with a noise like that produced by heavy wagons rapidly pass- 
ing over a paved road. When almost directly over the village 
of Hraschina, it burst with a tremendous explosion into two 
pieces, and at the same moment became enveloped in a cloud 
of smoke, which was at first black, and then presented a va- 
riety of colors. The fall was followed by a terrible crash, and 
a trembling as from an earthquake. The larger fragment, which 
weighed 71 lbs., (Austrian,) made an opening in the earth 18 feet 
deep and 2 feet wide, while the smaller of 16 Ibs. weight buried 
itself in a meadow 2000 paces distant. The large mass was 
presented to the Emperor Francis I, and the Empress, Maria The- 
tesa, by the Bishop of Agram, and is preserved in the Imperial 
Museum at Vienna: the smaller mass is missing. The m 
a triangular, tabular form, with ove side convex and the other 
slightly concave. It has a complete crust, in which is enclosed 
ho gravel or earthy matter, as must have been the case had it 
been in a liquid condition. It undoubtedly came to the earth in 
a glowing state, and revolving rapidly like a circular saw, so as 
to strike the ground edgewise, and thus penetrate to such an as- 
tonishing depth. The surface presents the usual concavities. 
The crust is brownish-black and without lustre, with a thickness 
of about three-fourths of a.line, thongh varying on different 
parts. It is somewhat fibrous in structure, and readily separated 
from the metal beneath, which. then appears smooth and polished. 
the convex side of the mass, the crust contains numerous 
fissures, usually about one-half inch long, though rarely from one 
to two inches, and from two-twelfths to three-twelfths of a line 
eep. The mass contains occasional intermixtures of magnetic 
pyrites, and displayed on fractured surfaces a crystalline structure. 
When etched, it exhibits most perfectly those characteristic fig- 
ures which were first discovered in this iron, by Widmannstatt 
in Vienna in 1808. Gr.=7:72 —7'82, Rumler. Analyses: 
WMaproth. Wehrle. 
Tron, - « 96°6 - 
Nickel, — - — Bb - 8886 
astahy gy fbaltoresa! siac ms 0-667 ‘ . 
i001 ar = = 
