Astronomy and Meteorology. 137 
fore, that this rotation can easily produce the bursting of an unequally 
heated stony mass, coming from a space whose temperature is —50° to 
only visible at a distance, close by only the black stones. In accordance 
with the above suggested powerful rotation is the breaking asunder of the 
flat mass in two pieces of 71 and 16 pounds respectively, by the centrif- 
ugal power. 
The report of the explosion of the Hraschina meteor was heard as far 
as Warasdin, which would give, taking Hraschina as the centre, an area 
of nearly 1000 square miles, over which the sound was audible. 
Tn opposition to Chladni’s theory, that the explosions of meteors are 
roduced from the centre towards the outside by the ursting of a tough 
ts 
the Surrounding air and thus the sound produced. 
The the highly crystalline strue- 
idi i interesting 
ture of meteoric irons was observed, and Haidinger gives a 
e typical form of Meteorites—In a paper ona 
typical form of meteorites presented at the meeting of the Imp. Acad. of 
* Kine Leitform der Meteoriten von W. HatvtncEr, 1860, mit 2 Tafeln, 
Am. Jour. Scr.—Srconp Series, VoL. XXXII, No. 94.—JuLY, 1 
18 
