The pond was my well ready dug. For four months in the year its water is
as cold as it is pure at all times; and I think that it is then as good
as any, if not the best, in the town. In the winter, all water which is
exposed to the air is colder than springs and wells which are protected
from it. The temperature of the pond water which had stood in the room
where I sat from five o'clock in the afternoon till noon the next day,
the sixth of March, 1846, the thermometer having been up to 65 deg. or 70 deg.
some of the time, owing partly to the sun on the roof, was 42 deg., or one
degree colder than the water of one of the coldest wells in the village
just drawn. The temperature of the Boiling Spring the same day was 45 deg.,
or the warmest of any water tried, though it is the coldest that I know
of in summer, when, besides, shallow and stagnant surface water is not
mingled with it. Moreover, in summer, Walden never becomes so warm as
most water which is exposed to the sun, on account of its depth. In the
warmest weather I usually placed a pailful in my cellar, where it became
cool in the night, and remained so during the day; though I also
resorted to a spring in the neighborhood.
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