390 McGee—Meridional Deflection of Ice-Streams. 
temperature, and afternoon precipitation predominates, in gla- 
ciated as in most other stations. Accordingly, the solar acces- 
sion of the east half of the assumed ice-stream will be freely 
dissipated through the diathermous forenoon atmosphere, while 
the west half accession will be not only conserved by the 
athermous afternoon atmosphere, but supplemented by the 
molecular and molar work, or in (1) elevating the temperature 
of the ice from that of inter-stellar space to that of a 
F a 
ular work is larger, by reason of the lower temperature to 
overcome, than during the afternoon when the west half faces 
the sun. It follows that the share of energy available 1 
sieerpensiom each day will be the greater in the wo 
hus the west half of the meridionally-moving ice-stream 
not only absorbs more heat than the eastern half, but utilizes 4 
larger proportion of it in generating movement; whence 3 
n 
eastward curvature of the stream. Such tendency depends for 
its strength upon many obscure elements, and hence cannot ' 
quantitively ex It is probably slight in the case of the 
be negl 
So many of the factors essential in th i lysis are 
. : : e foregoing ana yt 
indeterminate or variable that the numeric vate deduced above 
can only e Tegarded as a vague approximation even 1? the 
simplest case; and it is accordingly needless to deduce 
