SELECTING A LOCATION. 51 



contrary, ' ' as witness the many wild-orange groves 

 to the south-east of lakes and rivers. As our coldest 

 winds come from the north-west, the benefit of water 

 protection on any given location is in proportion to 

 the width of the water lying to the north-west, and 

 the proximity of such a body of water to said loca- 

 tion. There may be seeming .exceptions to this 

 general rule. Air currents are governed by laws 

 similar to those governing water. Hence, when 

 any obstruction suddenly opposes a current, whether 

 of air or water, an eddy or circular motion is given 

 to the current. Bodies of timber with dense under- 

 growth standing on the north or north-west of a 

 grove and along the shore of the river or lake have 

 the effect of creating a rolling current of air like a 

 breaker from the ocean rolling over a sandbar, and 

 so, when the wind is from the north-west, bring 

 down upon the grove a stratum of freezing air from 

 above. The remedy for this is to clear out the un- 

 derbrush along the shore and allow the warmer air 

 from the surface of the water to flow through the 

 grove. The taller trees should stand to keep the 

 violence of the wind from the orange .grove, and to 

 check the violence of the air current upon the moist 

 soil, which readily yields its moisture along with its 

 heat to a strong air current, and so intensifies the 

 cold. It is regretted that some good locations along 

 the St. Johns have been marred, and groves made to 

 suffer damage from want of attention to the above. 

 The above facts also account for the well-known 



