244 Of the Skin of Roots . 
At fig. 472. is feen a tranfverfe {lice of a horfe-raddifh 
root, and at a b the place from whence a gore was cut, 
which is reprefented as it appeared in the microfcope by 
fig. 473. whereof A B is the (kin : A B C D the bark : 
C D E F G H I the fap veflels in form of a glory : C D 
K L the wood in which the darker circles are the air 
veil'ds: KLMN a ring of more fap veiTels : MN O 
the pith. 
Fig. 474. exhibits a tranfverfe fe&ion of buglofe root, 
from which at c d was taken a final! piece, that when 
magnified appeared as fig. 475. in which A B is the 
jfkin : A B C D the bark : A B E F the bladders in the 
outer part of the bark; they are figured fomewhat ob¬ 
long, and are ranged in circles : EFCD the inner part 
of the bark in which the bladders are ranged in curved 
arches : C D G H a ring of fap veflels : 11 a parenchy- 
mous infertion, of which there are feveral in the whole 
fedtion : LKKL the wood in which the dark fpots 
are the air veflels : K K M the pith. 
Of the fldn of roots. 
T HE outer parts of all roots is the fldn, which in 
fkerrits is white, yellow in dock, red in potatoes, 
brown in lovage, black in buglofs, &c. their furface is 
fometimes fmooth, as in horfe-raddifh, rough, as in fcor- 
zoner-A. The {kins of the feveral {hells of a tulip-root 
frefh taken up, appear to be perforated with a number of 
fmall holes. This (kin is very thin in parfnip, thicker 
in buglofs, very thick in iris, opake in fome as the thiftle, 
and transparent in others, as the madder. 
Every root hath two kinds of fldn, one of the fame 
age with the other parts, and the other fucceeding in the 
place of the former; as in dandelion, the old {kin feems 
& . 
