' [ 1 33 ] 
tion. The fap in it muft have been extremely 
rarefied, and in very quick motion, whilft that 
of the tree was greatly condenfed, and in total 
inaction. Flow is it poffible to conceive a circu- 
lation of the fap from fuch a frozen root and flock, 
to a branch full of vigour, and loaded with leaves 
and flowers? Surely this experiment muft appear 
conclulive againft the fyftem of circulation ; fince 
in this cafe it couid at beft only be admitted to have 
taken place in the vegetating branch ; and that 
would very improperly be termed circulation, 
which fhould be confined to one limb. 
II. This experiment proves, that each part of 
a tree is furnifhed with a fufficient quantity of 
fap to effeCt the fir ft production of buds, flowers, 
and fruits. There is little probability that the 
branch drawn into the bot-houfe fhould have de- 
rived its fap from the roots of the tree : as they, 
at that time, lay in a very frnall quantity of earth, 
rendered extremely hard and dry by the froft. 
they could have but little liquor to fpare ; and 
even this, confidering the congealed ftate of the 
lympbatick veflels of the flock, could have found 
no paffage to the branch. This branch muft of 
courle have been enabled to continue its vegeta** 
tion by the quantity of fap with which it was 
provided, the confumption of which muft have 
been fupplied at the firft breaking of the froft.. 
This truth, now demonftrable by experience, had 
been pointed out before by a multiplicity of other 
faCts. Every body may have obferved that a tree, 
which has been blown down in autumn, though fe- 
parated from its trunk, begins the fame vegetation, 
that it would have done if it had remained ftand- 
