82 
VEGETABLE STRUCTURE. 
Nature in this obferves a gradation, ns if tlie change from the wide 
ceils formed by the arrangement of the Vellels of the Blea, to the fingl-; 
courfc of thefe fmali ones, \ve:e tco great and violent ; as the Blea riir-s 
more inward, that is, as it .approaches this Valcular Series, they become 
fmaller, the Vefielsallu which compofe them, become thcmfelves Icfs, till the 
two or three innermoft parcels are mere thread-. Clofe within thefe lies 
the Vafcular Series, of wh ch we are to fpeak in the next chapter j and 
the inner range of the ce Is of the Blea flicks clofely to it. 
To underftand this union, they muO; he torn afunder gently, and only in 
part. To this purpofe cut a tranfverfe fedtion of the Stalk near the ground, 
and then cut out of this a fmali puce from the furlace to the Pith : faflcn 
the piece upon a flat cork, with a fine needle in a handle, and with one 
of the crooked needles take hold upon the Rinds, draw them away, and 
they will come off together. In the fame manner lay good hold upon the 
Blea, and gently draw it away. The connedion between the Blea and the 
Vafcular Series, is fironger than between the feveral parts of the Blea it- 
felf: therefore the fubftance of the Blea will be very apt to break infiead 
of feparating from this matter within it ; but by care it may be got fairly 
afunder. 
A PIECE of the two fubflances which I was fo happy to feparate in this 
manner, is reprefented at Plate V. Fig. 53. Where the feparation being 
abfolute between the anterior part of the two fubflances, while they yet 
remain fixed together behind, we fee the nature of their connedion. In 
this Figure a reprefents the Blea ; and b the Vafcular Series, of whofe 
compofitlon we fliall fpeak prefently. 
From thofe parts of the Veflels of the Blea where they crofs one ano- 
ther, there rife fmali oval Veficles j the broad ends of thefe rife from the 
Vefiels of the Blea, and the fmaller ends always fixed to fome part of one 
of the Vefiels of this Vafcular Series. They pierce the Membranes on 
each part, and hold the two fubflances together, at the fame time that 
they make a communication between them. 
A PIECE of the inner furface of the Blea is reprefented at Fig. 54, vafi- 
ly magnified, to fiiew the origin and place of thefe Vefiels j and one of 
the Veffels itfelf at 56. This kind of union is kept up between the inner- 
mofl coat of the Blea and the Vafcular Series throughout the whole Plant. 
CHAP. 
