Book IV. of Leaves. 15 
er: 
CH AP. IV. 
Uf the Parts and Texture of the Leaf. 
COME next to obferve the feveral Parts, where- 
of the Leaf is compofed: and firft the skiz. This 
being ftript off the Leaf, although to the bare Eye 
it looks no otherwife than a Skiz of Ifinglafi : yet 
being viewed through a good Glafs, with a clear 
and true Light, and in an advantagious Polition; it 
@ appears to confit not only of Organical Parts, as 
do the skins of Animals ; but thefe alfo Regularly mixed together 5 that 
is, Of Parenchymous and Lignous Fibres, all very curionfly interwoven 
as it were, into a piece of admirably fine white Sarcenet: asin Flag, Tab, 48. 
Tulip, and the like. won 
2. $. From hence, it is eafy to conceive how the Skins of all 
Plants, as well asthofe of Animals, are perfpirable; fe. between the 
feveral Fibers of which they confift. But as the Skins of Animals, 
efpecially in fome Parts, are made with certain open Pores or Orifices, 
either for the Reception, or the Elimination of fomething for the be- 
nefit of the Body : fo likewife the Skins, of at leaft many Plants, are 
formed with feveral Orifices or Pafs-ports, either for the better Avola- 
tion of Superfluous Sap, or the Admiffion of Aer, e 
3. $. THESE Orifices are not in all Leaves alike ; but varied in 
fit Colla: Bignefs, Number, Shape, and Pofition : Serving to the different Nature 
midle: as of the Plant,or Leaf’; and giving the Leaf as it were,a different Grain. 
ft, or many, Princes Feather, i. e. a Sort of Sanicle, they ftand only on the Edges 
ally alle ofthe Leaf; but are very ample. In the White Lily, they are Oval, 
where the very white, and each furrounded with a {lender white Border, They 
where th ftand about a 6th or 8th part ofan Inch diftant,as they appear through Tab, 48: 
a good Glafs, all over the Leaf, but notin any regular Order. , Thefe 
adik Orifices ate the caufe of the Greyifh Clon the upper fide the Leaf: 
On = = Back.fide, in which there are none of them, is of a dark 
ea-Green. 
wire 4 $. Inthe Leaf of Pine, they are alfo Oval, arid about the fame 
a Bignefs and Number, asin that ofa Lily ; yet without a Border. But 
uf la their Pofition is very Elegant, ftanding all, moft exactly, in Rawk and Tab. 48: 
Api File from one end of the Leaf to the other. 
the m 5. $. NEXT TO the skiz,lies the Pulpy part of the Leaf; which 
gua Pats by the fame latitude, as Ufe hath taught us in many other Words, I 
e bere # call the Parenchyma. This Parenchyma or Pulp of the Leaf, like the 
the Pith, and all other Parenchymous Parts of a Plant is made up of in- 
comparably fmall Cylindrick Fibres: andthefe Fibres, in molt Leaves, 
woven and woun'd up into little Bladders. 5 
6. $. The Bladders are here of feveral Sizes, as in the Pith: but 
generally more vifible in the stalk, than in the Body of the Leaf. Va- Tap, 49. 
ried, as in the Pith, fo here, not according to the Size, but the Nature a 
of the Leaf. So in Common Dock, and Moth Mullein, both Great 
Ce Leaves, 
Oo 
