Book IL. of Trunks, 119 


CHAP W. 
Of the PITH. 
HE Third General Part of a Branch is the Pith. 
© Which though it have a different name from the Pa- 
renchyma in the Barque, and the Infertions in the 
Wood 3 yet, as to its Subftance, it is the very fame 
with them both. Whereof there is a double evi- 
dence, fc. their Continuity, and the famenefs of their 
pt Re Texture. Their Texture fhall be thewed prefently. 
As to their Continuity, it istobe noted, That as the shi is continu- 
ous with the Parenchyma of the Barque 5 and this Parenchyma likewile, 
with the Infértions in the Wood 5 fo thefe Infértions again, running 
through the Wood, are alfo continuous with the Pith. So that the Shzz, 
Parenchyma, Infertions, and Pith, are all One entire piece of Work; 
being only filled up, in divers manners, with the Veffels. 
2. §. The Size of the Pith is various, being not the fame in any 
two Branches here reprefented. In Wormwood, Sumach, Fig, Barbery, Tab. 24, 
"tis very large 5 Je. betwixt 5, and 7 Inches Diametre, as it appears 31,34, 35% 
through the Microfcope. In Pine, Ah, Holly, Walnut, not {fo large; 225 29 
from 3 Inches Diameter to 4. In Oak, Apple, Pear, Hazel, leffer, {carce 30, 32- 
from 2,to 3. In Damaféene, not above an Inch and half. And in Ela, 235 25> 
fearce an Inch Diameter. Note alfo; that of all Plazts,. both Herbs, 26, 35+ 
and Shrubs, have generally the largeft Piths, in proportion with the 27- 
other Parts of the fame Branch, as in Sumach, Fig, Barbery, is ma- 28. 
nifeft. 
3. §. It isalfo worth the noting, That wheras, in moft Plants, 
the Barque and Wood do both grow thicker every year : the P7th, on 
the contrary, groweth more flender 5 So that ina Branch of one years 
growth, it isapparently more ample, than in one oftwo; and ina 
Branch of two, than in one of three 5 and fo on. 
4. §. The Pith, forthe moft part, if not always, in the Branch, 
as well as the Root, is furnifhed with acertain number of Sap-Veffels. 
They are here ufually fo poftur'd, as to make a Rivg on the Margiz 
of the Pith. Where they are more numerous, or large, they are more 
evident ; as in Walnut, Fig, Pine, and others. They are alfo of di- Typ 24 
vers Kinds, anfwerable to thofe in the Barque3 as in Wallnut, Lym, ; 4 i 
pheduds; in Fig, Lathealss in Pine, Refiniferous. ar ae 
5. §. The Parenchyma of the Pith is compofed of Bladders. Which 
are the very fame with thofe in the Barque, and oftentimes in the In- 
fertions within the Wood. Only thefe in the Pith, are of the largeft 
Size ; thofe in the Barque, of a leffer 5 and thofe of the Infértzous 
leaft of all: for which reafon they are le(s obvious than in the Pith. 
6. §. The Bladders of the Pith, though always comparatively 
Great; yet are of very different Sizes. Being eafily diftinguifhed, even yp, 94 
as to their Hlorizontal Area, to Twenty Degrees. Thofe of Fig, Bar- .,, 
berry, and fome others, are fomewhat large. And of many Herbs, > A 
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