( i844 ) 
from the Wood— Wherefore, not finding my account 
in this Experiment, I turn'd my thoughts upon the Bark 
of Cherry, Plumb, Beach-tree, &l\ the Velftls of which 
Barks are not extended lengthways, but circularly about 
the Wood 5 and in order to demonftrate the fame, I cut 
off this fmall Twig of a Cherry-tree. 
Fig. I. ABCDE reprelents a thin Twig of a Cherry- 
tree, in the Wood of which the Canals or Veffels of the 
Bark, by which the fame is fed, ^re not extended length- 
ways, but circularly about the Wood 5 for which reafon 
the Bark of the faid Wood can't be ftripp'd off longways, 
but only circularly, contrary to fome other Woods, as in 
the afofef^id Figure 5 whereby CFDG, a fmall piece of 
the fame Bark, as it is ftripp'd off, is reprefented 5 in which 
you may obferve, that the Canals or Veffels, of which it 
is compos'd, run from C to F, or from D to G. 
I have afferted formerly, that in all Countries where 
there is any Winter, fo far as to put a ftop to the Growth 
of Trees, at all times as long as the Growth endures 
the Bark grows thicker, and that the New Bark does pro- 
trude that which was made before further and further 
from the Wood 5 infomuch that in the Barks of Old Trees, 
one may cut a Fingers Breadth in Depth before one can 
come at any thing like Grecnnefs or Sap: And if one 
confider thofe Barks with care, one (hall dilcover what 
part of the Bark from time to time is deprived of its 
Nourifhmenr, and confequently what part of it is quite 
dead. 
By thefe my laft Obfervations, 1 have difcovered in a 
Twig of a Cherry-tree of one years Growth, that the 
Bark does confift of at leaft fix thin Membranes, whofe 
exceeding thin Veffels or Fibres extended themfelves circu- 
larly about the Wood, and thofe Membranes were very 
clofely united to one another* 
I placed one of thefe Membranes, that was as nicely 
feparated from the reflr, as it was poflible for me to do, 
belbre 
