Of the 'Trunks of Trees. 255 
A B C D the pores in the outfide fkin or bark of the 
cane are plainly vifible. 
fig. 477. reprefents a magnified piece of the flalk of 
burdock cut tranfverfly and down the fide. 
Fig. 478. exhibits a piece cut out of a branch of pine, 
wherein at A B C D is feen the bark fide-ways, and at 
A B F E a tranfverfe fedlion thereof, through which the 
turpentine veffels run lengthvvife. G H reprefents one 
r of them cut down the middle to fhew the infide of it, 
and another is feen intire at I K. 
fig. 47g. reprefents the milk veffels in the bark of 
fumach, in the fame manner as the turpentine veffels are 
reprefented in the foregoing figure, and are expreffed by 
the fame letters alio. 
Fig. 480. reprefents part of a vine branch cut tranf¬ 
verfly ; and fig. 481. a piece cut out of the fame at a b, 
as it appeared in the microfcope ; whereof A B C D fh-evps 
the fkin length-ways. At A B E F is feen a tranfverfe 
fection of the wood and air veffels, and between G H and 
I K part of the wood and bark is taken away to fhew 
the fame lengthwife. 
Fig. 482. a, is a tranfverfe fedtion of ait apple branch, 
in which the feveral circles of wood that fhew of how 
many years growth the tree is, are vifible to the naked 
eye. Fig. 482. b, reprefents a gore cut out of the afore- 
faid flice at a b, as it appeared in the microfcope; in 
which A B reprefents the fkin: A B C D the Bark: H I 
fpiral fap veffels in arched parcels : O O the common fap 
veffels which begin to turn into wood : C D E F the 
wood of three years growth: KLMN one year’s growth, 
in which the dark fpots reprefent the air veffels: g g g the 
true wood : P P the infertions : E F other fin veffels: 
E F G the pith. 
