42 
THE ENTOMOLOGIST’S WEEKLY INTELLIGENCER. 
towards the North Pole, where it again 
has its course arrested, and ascending 
to the upper regions it returns as an 
upper current from the north-east. 
Occasionally, but more especially at 
this season of the year, this upper 
current descends to the surface of the 
earth, and coming to us direct from 
the polar regions, where all its moisture 
has been frozen out of it, arrives here 
both very cold and very dry. 
As our spring east winds arrive so 
very regularly about the same time, 
just after the vernal equinox. Admiral 
Fitzroy has suggested that they are 
mainly due to the gradual turning 
of the North Pole towards the sun, and 
consequent melting of the polar ice. 
Water in freezing gives out heat; ice 
in melting absorbs it: hence the winds 
that come to us from the melting ice 
have a peculiar bitterness of cold, 
which the east winds lack at other 
times. 
The Entomologist’s Weekly Tntel- 
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