





















































22 
. 
An Account 
of the 
Growth of 
the Trunk. 
The Anatomy Book I, 

bly extended by the length of the Pith; but are really difconti- 
nuous and fhort, and as ‘tis faid, fomewhat anfwerable to the Cells 
of an Hony-Comb. This is the neareft we can come to them, by the 
bare Eye without the afliftance of a good Microfcope. Mr. Hook 
fheweth in his Mécrography, That the Pores of the Pith, particularly of 
Elder-Pith, {o far as they are vifible, are all alike difcontinuous ; and 
that the P2th is nothing elfe but (as he calls them) an heap of gwb- 
bles; Although, in regard they are not fluid, but fixed Parts, I fhall 
choofe rather to call them, Bladders. As they appear through a good 
' Glafs, in a piece of Burdock , See in Tab. 3, But a more par- 
ticular Defcription of the Sizes, Figures, and admirable Textures here- 
of, I have given in feveral places in the following Books. 
19. §. Befides what this Obfervation informs us of here, it 
farther confirms what in the Second Chapter we have faid of the 
Original of the Pith and Cortical Body, and of the famene& of 
both their natures with the Parenchyma of the Seed: which is no- 
~ thing elfe but a Mafs of Bladders 5 as inthe Firft Chapter hath been 
-g. faid. 
20. §. Inthe Péths of many Plants, the greater Pores or Bladders 
have fome of them leffer ones within them, and fome of them are 
divided with crofs Membranes: And betwixt their feveral fides, have, I 
think, other fmaller Bladders vifibly interjeted. However, that 
they are all permeable, is moft certain. They ftand together not confa- 
fedly, but in even Ranks or Trains 5 as thofe of the Infértions by the 
breadth, fo thefe by the length of the Tiwwk, And thus far there is a 
general correfponding betwixt the parts of the Root and Trunk, Yet 
are there fome confiderable Difparities betwixt them; wherein, and 
how they come to pafs, and to what efpecial Ufe and End, fhall next 
be faid. 
21. §. WE SAY then, that the sp being in the Root by Filtra- 
tions, Fermentations (and in what Roots needful, perhaps by Circu- 
lation alfo )duly prepar’d; the prime part thereof pafling through 
the intermediate Coaréure, in due moderation and purity is entertain’d 
at laftinto the Trazk, And the Sap of the Trunk being purer and 
more volatile, and fo it felf apt to afcend; the motion of the Trunk, 
likewife will be more noble, receiving a difpofition and tendency to 
afcend therewith. And what by the Sap the Trunk is in part dipos'd 
to, by the refpective pofition and quantity of its Partsit is effe@ual- 
ly enabled. For whereas in the Root the Ligvous Body being in pro- 
portion with the Cortical, but little, and all lying clofe within its 
Center it muft therefore needs be under its controul: on the con- 
trary, being here comparatively of greater quantity, and alfo more 
dilated,and having divers of its Branches ftanding more abroad towards 
the Circumference, as both in the Leaves and Body of the young Trunk 
and Plume, is feen5 it will in its own magvetical tendency to a/cend, 
reduce the Cortical Body to a compliance with it. 
22. g. And the Truk thus {tanding from under the reftraint of the 
Ground in the open Air, the difpofition of its Parts, originally different 
from that of the Parts in the Root, will not only be continued, but 
improved. For by the force and preffure of the Swp in its collateral 
Motion, the Lignons Body will now more freely and farther be di- 
lated. 

