VEGETABLE STRUCTURE. 
H3 
The Root, Fig. i, a, is brown, oval, tuberous, and lies nearly horizon- 
tally in the ground j fending long, pale brown Fibres every way upward, 
downward, and on each fide. On fpliting this lengthwifc, together with 
the Stalk, as at Fig. 2, there appears to the unadided eye a white folid 
mafs, a, with a yellowilh circle, b, in it; and covered with a brown Rind, 
c, from the head or crown of which rifes a Stalk, d, among (ome Films, 
e. The Microfcope difcovers in this all the effential and conftituent parts 
of a Plant, ranged in the following order, i. A very thin, brown outer 
Bark, which is a mere Film. 2. A pale inner Rind, three times as thick 
as the former. 3. A -white Biea, of a fpungy texture. 4. A Vafcular 
Series. 9. a FleOay Subdance, moderately thick, and of a pale hue, with 
a tinge of yellowilh. 6. The Conic Cluders, fmall, and greenifla. And 
7. within thefe the Pith. 
The part of the Root next the crown fliews thefe fevcral fubdances 
mod didindly : they gradually blend with one another toward the bafe ; 
and'only a powerful Microfcope fhews them. In a dice cut fo thin as to 
be tranl'parent, the outer Bark is thus feen to be vafcular; the inner Rind 
abfolutely fpungy, from the number and largenefs of its Vtdels ; the Blea 
is cellular, but the cells are fmall ; the Vafcular Series is condderably thick; 
the Flelhy Subdance contains fewer Vedeis, but thofe plain, large, and 
didind: ; and from the fides of thefe flioot branches, which run into the 
other parts : the Conic Cinders are fmall, and nearly oval : and the Pith 
is an abfolute fpunge ; it is compofed of Vedeis, in whofe cavities we fee 
a thick Huid, joined l;ke beads in a necklace ; and of a great deal of loofe 
white matter between them. 
From various parts of the Root arife Buds, which, by degrees, grow 
to a fufficient bignefs tor parting from it ; and forming new Plants. Thefe 
all rife from the Flediy Suhdance ; and raife with them all the other coats 
but they have no connedion with the Pith. They are fent off from the 
outer furface only of the Flelhy Subdance ; and they foon daoot inwards a 
Pith of their own. They take coverings a!fo from the three Coats they carry 
with them, and each Offset has a Rudiment of a Plant in its Crown,, 
covered by fcaly fubdances, formed of the ends of the feveral Coats. 
The Fibres of the Root have the fame origin with thefe Buds; they 
arife plainly and folely from the exterior furface of the Fledoy Subdance,, 
which fends out a part of its thicknefs into them ; the main body of it 
purfuing its own courfe, round the Root; and thefe Fibres alfo foon fhoot 
inward a Pith of their own ; and taking with them Coats from the three, 
outer 
