( 654 ) 
the liberty offending you the Eight part of the tranfverfe Slice of 
an Afli-fprig of a years growth; and fliali withall acquaint you, 
that befides thofe two forts of Veffels in wood, I have difcover'd 
aC5) third fort; thefe two going direflly upward, and this 
5' third ifTuing out of the middle or the pith, going horizontally 
to the_circmnference: Sothat the CO whole body of Wood hither- 
to viewed by mejconfirtsof nothing but of fipall hollow pipes. 
Thefe p)pe?, out of which the firm wood is made up, are in 
7* many places a^C?) clear as cry ftai, and in other places, methinks, 1 
8« fee them to coofift in part,of W fmall globals. The great Veffels, 
obferv'd and exprefftdby Dr. Gretv^ were feenby me very mani- 
feftly toconfiftof fmall globuls^ Ihefe great Veffels are general- 
ly furnifii'c with fmall membranes, which being cut thro gh,may 
be feen to lye obliquely in the Veffels; and thefe 1 conceive to be 
9- C9)valves. 
10. (lo) Thefe three forts of Veffels then, I have obferv'd not only in 
Jjb'wcod^hut 2i\Co'm Elme, Oak^WiUovif^Shumaok^Lime-tree^jipfle^ 
Pear, Flam, Walmt, H^p/ tree &c. And all the Veffels, which 
Dr. CTrew hath reprefented in /lfl>2iV\d other wood, though they 
differ from one another in bignefs, yer, under favour, I take them 
to beC* 0 of one fort. And though I have fome Obfervations which 
I keep yet to my felf, yetthis which concerns the three forts of 
poresor VeffelsIam willingtocomunicateuntoyou, as lallbbave 
fliew'd them here to divers curious perfonsthat were pleafedto 
vifit me; to whom I have alfo made it out, as well as I could, how 
J 2. Trees and other Plants do grow inheight and thickncf5,Ci2)of which 
I doubt not but Dr- GreiKf hath written fo learnedly that I fliall 
not need to difcourfe of it here* 
Tab'iL Fig. I. A B is one of the great pores or Veffels of an Jjb twig 
of one years growth, cut longways the little twigg, through the 
13. middle of the pores; which VelTel confifts of 03) tranfparent glo- 
buls, where-inyou may plainly fee the fmall oblique membrans 
14. by me (H^cal'd vaIves,whichmembransdonot ly with their upper 
part extended one and the fame way,bu t they lye fo as that two fides 
of them with their uppet end reach towards one another, as CC. 
and DD* Andif wefuppofe,thac the hollownefsof thefe greater 
Veffels is as brge as a hair of ones head, we may then very well fay, 
1$. that th6hollownefs(i5)ofthe fmall ones is at leaft 25 times (mailer 
16. thanfuchahair. That thefe Veflels 00 confift of globuls, I have 
not only feen in J/b-wood, but alfo in Walnut , Hajelj ^pple, Fedr, 
and f ///Wjtrees &c. 
