[ r 32 ] 
upper part of apples and pears, and is commonly 
called the eye. 
I now return to my fir ft experiment; the con- 
fequences of which, as I have crercribed them, feem 
to prove, 
I. Firft that the circulation of the fap does not 
take place in plants, as the circulation of the 
blood in animals. This may be deduced from the 
following obfervations. 
The tree in the hot-houfe went through all its 
changes during the winter, and the branch ex- 
pofed to the open air underwent none ; confe- 
quently the fap, which was in action in the root, 
flock, and head, of the tree, did net circulate 
through the branch without ; Which had no fliare 
in the vegetation of the roots and trunk. It might, 
indeed, be argued that the cold air, to which 
this branch was expofed, flopped the circulation, 
and therefore that the firft experiment would not 
be decifive ; but the inverfe of it feems fully fo. 
The tree placed on the outfide of the hot-houfe 
continued, during the whole winter, in the fate 
of numbnefs, natural to all trees, Which are ex- 
pofed at that feafon ; but one of its branches, 
which was in the hot-houfe, put forth fucceflively 
its buds, leaves, blofibms, and fruits. W'hilft 
therefore the root of the tree, to which this branch 
belonged, was in the ground lo frozen, that the 
pot itfelf, in which it flood, was broken by it, 
whilft the flock and top of the tree were fo co- 
vered over with ice, that many of the branches 
were killed ; this branch alone did not in the leafl 
partake of the common flate of numbnefs and fu fi- 
fe ring, and was on the contrary in full vegeta- 
v 
