( 201 ) 
one aboveanothen as they are here drawn between the up- 
rifing Vefsels P Q^OlSi. Fig. 4. 
The fecond fort of Horizontal Vefsels which lye in great 
numbers together, but in fome places much more then o- 
thers, are dcfcribed Fig. 2. ABorC D; bur when we cut 
the Wood in pieces longways, and thereby cut crofsthefe 
Vefsels, then they appeartoour naked Eye as Fig. 5.EIS, 
I have alfo drawn the fame in many places at their length* 
with crooked Partitions, which I judged to b^ Valves 
tho l have not been able to fee them always fo clearly as 
they are here exprefsed, but after I had found them fbme 
times, I concluded them to be generally fo, , both becaufe 
i have feen them in Elm Wood, as alfo that I concluded 
without thefe Valves it were impoffible the Tree fliould 
increafe in thicknefs, bscaufe of the force that is necefsary 
roc only to ^ feparate the Bark in theSpringfrom the wood, 
and keep it locfe s but alfo to cleave and open the Bark all 
the time the Tree is growing, and thereby make place 
for its increafe in thicknefs. Now if there were none of 
thele Valves, then the Sap which was impelled by the heat 
of the Sun againft the £ark, with the fetting of the Sun 
(when I conceive the Sap ceafes ^ to rife) would fall back 
again, and caufe a labour in vain. In this finall piece of 
Wood Fig. 4. Tj V. (delcribed by a magnifying Glafs- 
which augmenteth more then that by which the Uprifing 
Veffels are drawn^ thatfo the Vefsels might appear more 
diftinilj there are more then acooVefsels, eachof which 
if it be allowedbut iofa Grain of force in the protruding 
i $lg, MalpigKi. afidDr. Gtcvt do both make thefe TaYtitions to be the Temlna^ 
tlomofthe bladders of which thefe Radiated parts confifl^ andmtValv's, Seethe 
foYemention*d Anatomy of Tr, 21. ai, 22. and Anat, of Roots^ 7ab, 7. 
t Dr. Ctcvi thkks that the Barkis never p^arated from the mod, See A'4(tt<. 
^(Tt. p, 52. &s, 
i Ta. Vims and other fknts dahlnd day and night. 
