REVIEW. 
surface of the snow remains unchanged. Presently, 
within some particular zone, determined by causes 
not to he entered into here, you see a slight crimping, 
followed hy a dotted or Petersham-cloth appearance 
on the ice. This is followed again very rapidly hy a 
multitude of transverse ridges or waves ; and now for 
the first time you become conscious of a sharp, hum- 
ming, grinding murmur. 
Cast your eyes now over the level floe — level of a 
miniite ago — and you will see that on each side of 
you there is a descent, and that the descending sur- 
face is curved. The snow is in motion, and small 
fissures fly over it in every direction, but principally 
parallel to the lines of pressure. The noises now be- 
come mingled with reports, not loud, but prolonged, 
like breaking the crust of a giant loaf of bread. Sud- 
denly the lines of snow-fissures open into wedge-like 
chasms. Now run for it, without stopping to ques- 
tion; you have been standing all this time in the 
very centre of a forming hummock. 
As you run, loud explosions, accolnpanied by a 
whirring as of spinning-jennies, and a whining as of 
young puppies, bring you up ; and turning, you see 
