Influences of Wind-breaks. 79 
upon the patches of wild berries. It is not often, 
however, that the forest areas become a very serious 
menace to fruit-growers. 
Review of the influences of wind-breaks upon fruit 
plantations.— The benefits derived from wind-breaks 
are numerous, most positive in character, and appear 
to possess sufficient importance to warrant the 
strongest recommendations of horticultural writers. 
Yet the injuries occasionally sustained in consequence 
of shelter belts may be serious, for it is a well 
attested fact that trees sometimes suffer from cold 
in the immediate vicinity of a dense wind-break 
when they escape injury in other places. This fact 
is easily explained, however. The influence of a 
wind-break upon the temperatures of an adjacent 
plantation is governed by its position with reference 
to prevailing or severe winds. Of itself, wind 
probably exerts little or no influence upon tempera- 
ture. It acquires the temperature of surfaces over 
which it passes. If these surfaces are colder than 
the given area, cold winds are the result, or if 
warmer, as a large body of water, the winds are 
warm. But wind often causes great injury to plants 
because of its acceleration of evaporation; and winds 
which are no colder than the given area, if com- 
paratively dry, may consequently do great damage to 
fruit plantations. This is particularly true at cer- 
tain times during the winter season. Land winds, 
being cold and dry, are therefore apt to be danger- 
ous, while winds which traverse large bodies of 
water, and are therefore comparatively warm and 
