C.F. Dutton—Lffect of a warmer Climate upon Glaciers. 15 
(29.) The first effect to be considered is the shortening of 
the time of snowfall, so far as this time depends upon the 
changes of seasons. It is plain that the increment of tempera- 
ture due to increased radiation must pervade every portion of 
the earth and throughout the entire year. Quite likely the 
increments would be unequal in different latitudes and unequal 
at different seasons. Still there wou e an increase at all 
places and at all seasons. The summer would come earlier and 
stay longer; that is to say, the time during which it would be 
cold enough to snow would begin later in the autumn and end 
earlier in the spring. 
(30.) The second obvious effect is that. the rate of precipita- 
tion, whether for rain or snow, would be increased. For by 
the hypothesis the precipitation would be the result of cooling 
air at a higher temperature than before and equal amounts of 
g. 
Thus the time of snowfall would be diminished, but the 
average rate of snowfall would be increased. The amount for 
the year is simply the product of the time multiplied by the 
average rate of snowfall. Since one of the factors would be 
U 
of snowfall Lae increase, and the total annual snowfall would be 
diminished by a warmer climate. There is an exception or 
rather a class of exceptions which will presently be adverted 
to. The proof of the proposition is simple and conclusive. 
Since the warm weather is extended further into the autumn 
into December; to push the snowfall of March (wholly or in 
part), back into February, and that of February back into Jan- 
uary. The snowfall which originally belonged to December 
and January, has simply disappeared. Meantime the former 
heat of June comes now in May and the heat of July goes over 
into August.* Two new thermal months have made their 
* 
ircumlocution. i : for a short period of time, having 
& Variable me rage habs 6b Se ae a definite aneion to the distribu- 
tion of temperature A cha aaa the year. This period may be of any length, from 
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