82 



The Principles of Fruit-growing. 



in that region demand a free circulation of air from 

 the lakeward, while desiring protection from the east. 

 (Cf. Mr. Cook's letter in Table IV., page 70.) This 

 experience, however, does not argue that wind-breaks 

 should be entirely abolished on the lakeward sides 

 of plantations, but that such breaks should be thin 

 enough to allow of the passage of wind, while break- 

 ing its force. In such places, a wind-break should 

 be simply a wind-break, not a wind -stop. 



The diagrams (Figs. 4 and 5) admirably illustrate 



Fig. 4. The deflection of winds over a lake bluff. 



these remarks. Fig. 4 is a diagram of a high bank 

 on Lake Michigan. The strong winds from the west- 

 ward strike the bank and are deflected upward, and 

 strike the surface again at some distance from the 

 cliff, leaving a comparatively still space at A. Decay- 

 ing substances on the beach of the lake are often 

 more obnoxious to those living half a mile or more 

 from the lake than to those living near the bank. 

 Fig. 5 is a diagram showing a similar deflection of 

 wind and a comparatively still area (A) by a very 

 dense wind-break. 



