206 
INTERNAL STRUCTURE AND 
Glaciaire”) show that in the higher part of the 
glacier, especially in the region of the ?iev£, the 
bottom of the mass seems to move more rapidly 
than the surface, w r hile lower down, toward the 
terminus of the glacier, the surface, 
on the contrary, moves faster than 
the bottom. The annexed wood-cut 
exhibits a longitudinal section of the 
glacier, in which this difference in 
the motion of the upper and lower 
portions of the mass is represented, 
the beds being almost horizontal in 
the upper snow-fields, while their low- 
er portion slopes more rapidly down- 
ward in the nev£ region, and toward 
the lower end the upper portion takes 
the lead, and advances more rapidly 
than the lower. 
I presented these results for the 
first time in two letters, dated Octo- 
ber 9th, 1842, which were published 
in a German periodical, the Jahrbuch 
of Leonhard and Broun. The last 
three wood-cuts introduced above, the 
transverse and longitudinal sections 
of the glacier, as well as that repre- 
senting the concentric lines of strat- 
ification on the surface, are the iden- 
tical ones contained in those communications. 
