Book IV, of Leaves, 153 
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CH AP. IV. 
Of the Parts and'Texture of the Leaf: 
@ COME next to obferve the feveral Parts, where- 
¥ of the Leaf is compofed: and firft the skz. This 
being ftript off the Leaf, although to the bare Eye 
it looks no otherwife thana shiz of Ifinglafs: yet 
being viewed through a good Gis, with a clear 
and true Light, and in an advantagious Pofition; it 
Lp Pilea @ appears to confift not only of Orgawical Parts, as 
do the skins of Animals ; but thefe alfo Regularly mixed together 3 that 
is, of Parenchymous and Lignous Fibres, all very curionfly interwoven 
as it’ were, into. a piece of admirably fine white Sarcenet - as in Flag, Typ 18 
Tulip, and the like. ‘iin 
2. ¢. From hence; it is eafy to conceive how the Shins of all 
Plants, as well as thofe of Azimals, are perfpirable 5 fc. between the 
feveral Fibers of which they confift. But as the Skins of Animals, 
efpecially in fome Purts, 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 Skivs, of at leaft many Plezts, are 
formed with feveral Orifices or Pafs-ports, either for the better Azola- 
tion of Superfluous Sap, or the Admiffion of Aer. 
3. §. THESE Orifices are not in all Leaves alike 5 but varied in 
Bignefi, Number, Shape, and Pofition : Serving to the different Nature 
of the Plant,or Leaf; and giving the Leaf, as it were,a different Grain. 
Princes Feather, 7. e. a Sort of Sanicle, they ftand only on the Edges 
of the Leaf’; but are very ample. Inthe White Lily, they are Oval, 
very white, and each furrounded with a {lender white Border, They : 
ftand about a 6t or 8th part ofan Inch diftant,as they appear through Tab, 48; 
a good Glafs, all over the Leaf, but not in any regular Order. Thefe 
Orifices are the caufe of the Greyifh Glofs on the upper ‘fide the Leaf: 
for the Back-fide, in which there are none of them, is of a dark 
Sea-Green. 
4. §. Inthe Leaf of Pine, they are alfo Oval, and about the fame 
Bignefs and Number, asin that ofa Lily, yet without a Border. But Tob 
their Pofition is very Elegant, ftanding all, moft exactly, in Rank and **”* 48. 
File from one enid of the Leaf to the other. 
5. §. NEXT TO the Skiz,lies the Pulpy part of the Leafs which 
by the fame latitude, as Ue hath taught us in many other Words, I 
call the Parenchyma. This Parenchynia or Pulp of the Leaf, like the 
Pith, and all other Parenchymons Parisof a Plant is made up of in- | 
comparably fmall Cylindrick Fibres: and thefe Fibres, in molt Leaves, 
woven and woun'’d up into little Bladders. , 
6. §. The Bladders are here of feveral Sizes; as inthe Pith: but 
generally more vifible inthe stalk, than in the Body of the Leaf: Va- Tab, 40, 
ried, as in the Pith, fohere, not according to the Size, but the Nature we 
of the Leaf. So in Common Dock, and Moth Mullein, both Great 
Gic Leaves; 


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