ret'refli and fupplc them, but alfb convey 
nourifhment to them : But in the cafe of 
lharp frofts after fliowers of rain, thefe fhel. 
ters and other fences muft needs be of ex- 
cellent ufe to prevent the almoft total de- 
ftrudlioii which is occafioned by the freez- 
ing of the tender parts of vegetables, when 
they are full faturate with rain. 
The full proof we have from thefe Ex- 
periments, of the ferviceablencfs of the leaves 
in drawing up the fap, and the care we fee 
nature takes, in furnifliing the twigs with 
plenty of them, principally near the fruit, 
may inftru(^d us on the one hand, not to be 
too lavifli in pruning them off, and to be 
ever mindful to leave fome on the branch 
beyond the fruit 5 and on the other hand, to 
be as careful to cut off all fuperfluous (hoots, 
which we are affured do draw off in waftc 
great quantity of nourifhment. And might 
it not be advifeable, among many other ways 
which are preferibed, to try whether the 
too great luxuriancy of a tree or branch 
could not be much checked by pulling off 
fome of its leaves > How many experience 
will beft teach us, the pulling all off will 
endanger the killing the branch or tree. 
There is another very confiderable ufe of 
3 the 
