376 March 174.9? 



in a cold winter, and often all the peach-trees 

 in a whole diftridl: are killed by a fevere froft. It 

 has been found repeatedly, with regard to thefe 

 trees, i hat they can ftand the froft much better 

 on hills, than in vallies ; infomuch, that when 

 the trees in a valley were killed by froft, thofe 

 on a hill were not hurt at all. They affured 

 me that they had never obferved that the black 

 walnut-tree, the faffafras, and other trees, had 

 been hurt in winter. In regard to a froft in 

 fpring, they had obferved at different times, that 

 a cold night or two happened often after the trees 

 Vvere furnimed with pretty large leaves, and 

 that by this rnoft of the leaves were killed. But 

 the leaves thus killed have always been {tip- 

 plied by frefh ones. It is remarkable that in 

 ifach cold nights the froft acts chiefly upon the 

 more delicate trees, and in fuch a manner, that 

 all the leaves, to the height of feven, and even 

 of ten feet from the ground, were killed by the 

 froft, and all the top remained unhurt. Several 

 old men affured me they had made this obferva- 

 tion, and the attentive engineer, Mr. Lewis Evans, 

 has ihewn it me among his notes. Such a cold 

 night happened here, in the year 1746, in the 

 night between' the i4th and I5th of June, new 

 ftyle, attended with the fame effect, as appears 

 from Mr, Evans's obfervations. The trees which 

 were then in bloiibm, had loft both their leaves 

 and their flowers in thefe parts which were neareft 

 the ground ; fome time after they got frefh leaves, 

 but no new flowers. Further it is obfervable, that 

 the cold nights which happen in fpring and fum- 

 mer never do any hurt to high grounds, damag- 

 ing 



