Crystallization of Snow. 337 
bottom and sides of the glass, which, when rubbed between 
the fingers, produced a fine ash-coloured powder without 
taste or smell; the whole of which migit have been inclu- 
ded in a lady’s s thimble. 
The place where the substance was first found was exam- 
ined, and nothing was to be seen but a thin membranous 
substance adhering to the ground similar to that found on 
glass 
This singular substance was submitted to the action of 
acids. With the muriatic and nitric acids, both concen- 
sulphuric acid a violent effervescence ensued, a gaseous 
dy was evolved, and nearly the whole substance dissoly- 
ed. There being no chemical apparatus at hand, the 
evolving gas was not preserved, or its properties examined. 
Arr. XXII. On the crystallization of Saiki: by Profedser 
_Jacos Green, of Nassau Hall, Princeton. 
_ Tux crystallization of snow has for a long time excited 
the attention of the curious; few accurate observations 
however have been made upon it. Like the other phenom- 
ena of crystallization, this process is involved in much ob- 
seurity. Beccaria supposed that the regularity often no- 
ticed m these crystals was owing to electricity, and this will 
vapour is fornied or ibndwinsbd; the bodies i in contact with ‘aa 
va become electrical. Haiiy has rendered it extreme- 
ly probable that the integrant particles of matter always 
combine in the same body in the same manner, and that the 
combination is occasioned by cohesive attraction. May 
We not rationally suppose that what is called electrical ae 
would induce them to cohere, not sarentsgrerer A 
in certain determinate forms. ne ot here repeat the 
= mene which prove that the shone of electrical 
precisely analogous to those of magnetism, or 
that manned rill roduce asteroidal figures with steel filings. 
With these hints [ leave the theoretical part of the subject. 
