A. Bigelow on the Freezing of Water. 207 
Again, one morning in February, stepping down to the edg 
of the river I noticed glistening particles of ice upon chips and 
sticks in great abundance, which proved, on examination with a 
magnifier, to be hexagonal hopper-formed bodies upon small icy 
pedestals. The diameter across the top of the 8. 
gon was about one line. The form was very perfect 
and beautiful, with fine lines running around as if 
they were the divisions of the crystalline layers, as 
= shown in the accompanying magnified drawing. 
s due to more rapid 
struck me as parallel to the second 
this case the angles are com- 
1. That water 
forms 
In freezing, under favorable conditions of temperature, 
Plates containing between them thin layers of water. cue 
