f r 3 6 ] 
trees of the fame fort, but placed to the north, 
or in fome other expofition, will ftand the hardeft 
frofts. This is particularly remarkable in the 
ever -greens, whole relinous and .oily fap being 
liquefied by the heat of the fun, the tree cannot 
efcape fuffering a great deal, whenever it is fur- 
prized in that Hate by the night frofts. Thofe 
obfervers, who attend to this, and know how 
well pines, firs, and bays fucceed, when planted 
on the back of mountains expofed to the north, 
will take care not to place luch kind of trees in 
a fouthern alpect, in hopes of their fucceeding 
better by it. 
Many other confequences might be drawn from 
thefe experiments ; but the bounds, I have af- 
iigned to this paper, do not allow it. I propofe 
examining them more at large in a treatife upon 
vegetation, which, I hope, the obfervations and 
experiments I have made, may render interefting 
and ufeful. 
XVI. Actual 
