4 ©. EF. Dutton—LHfect of a warmer Climate upon Glaciers. 
therefore consider an imaginary year which shall represent the 
average conditions of a thousand years. It would have such 
characteristics as the following: In most localities every day 
in the year would show some precipitation, but with one or 
more maxima in one or two parts of the year, and a corres- 
ponding number of minima. In a few localities it is just pos- 
sible that some part of the year might show no precipitation at 
all, the function becoming discontinuous. Hach day in the 
year would have some definite rate of precipitation (quantity 
divided by the time). Hach day would have its proper sea- 
sonal temperature and variations of temperature and all would 
follow some expressible Jaw determined by the general and 
snowfall just now, be it observed, but the entire precipitation 
both rain and snow. We shall separate the snowfall after- 
wards. This is quite necessary, for the omission to consider 
the total effect of a general increase of climatal temperatures 
has been the stumbling-block of quite a number of those who 
degrees fall of temperature, is implied in the second factor; 
for this amount is simply the rate multiplied by the time, and 
the time is now unity. 
(7.) The quantity of air which at any time is yielding moisture 
to any locality is that quantity which blows over it as wind. 
and as fast as one body of air is depleted another body of it 
takes its place. The quantity of air, then, which is to yield 
moisture is simply proportional to the velocity of the wind. 
