80 
GREENLAND VOYAGE. 
cur at low temperatures. In like manner, all the 
varieties I have observed in snowy deposits on 
the rigging, were produced under different tem¬ 
peratures. At 10°, the form of the crystal of 
the fringe was a beautiful feather, possessing a 
perfect arrangement of the different parts, cor¬ 
responding with the shaft, vane, and rachis *. At 
a higher temperature, probably 22° or 23°, the 
crystal consisted of a combination of angular cups, 
inserted into one another in a herbaceous form, 
not unlike a species of erica or heath. At 26° or 
28°, it consisted of spines, or rosettes of spines, as 
above : and at the temperature of 30° or 32°, the 
deposition was generally uncrystallized, forming 
a glassy coating of transparent ice. 
On the 7th of June, such finely marked ice¬ 
blinks appeared in the atmosphere, in connection 
with the horizon, as to present a perfect map of 
all the ice and openings of water for twenty or 
thirty miles round. The reflection was so strong 
and definite, that I could readily determine the 
figure and probable extent of all the fields and 
floes within this limit, and could distinguish 
packed or open ice, by its duller and less yellow 
image ; while every vein and lake of water, pro¬ 
ducing its marked reflection by a deep blue, or 
* Vol. i. p. 4S8, &c. “ Account of the Arctic Regions." 
