54 Practical Orcharding On Rough Lands. 



level plateau of several thousand acres, and 

 there may even be slight depressions in the land, 

 which would tend to act as frost pockets While 

 on the other hand the site which is only about 

 500 feet above the sea level is probably located 

 on the top of the hUl or ridge, with an abrupt 

 descent on one or more sides, thus enabling the 

 cold air to escape or be drawn ofif to the lower 

 lands. So when considering air or frost drain- 

 age let us look for abrupt descents and not high 

 elevations, always remembering that it is the 

 comparative elevation of the surrounding lands 

 and not the altitude of the site itself that counts 

 in the matter of frost drainage. 



We should note the difiference between a frost 

 and a freeze. Frosts occur on still, clear nights. 

 We often say it will frost tonight if it should 

 clear off an,d the wind stop blowing Then 

 frosts are more or less local ; while freezes fre- 

 quently come with or on the heels of a storm, 

 so are not infrequently accompanied by a high 

 wind and very often occur on cloudy nights. 

 A freeze is more general over the whole section 

 and will not play as many pranks of ski|)^ hop 

 and jump as does the frost. Then Jack Frost 

 always wears a white coat 



Air drainage may protect against frost but 

 not against a freeze, such as swept over many 



