


































































































ap ER Re, 
- 416 
Tab, 23, 
25, 26. 
22,24, 27. 
29230 33- 
52. 
Tab, 28, 
33- 
22, 26. 
Tab. 22, 
23, 25. 
24, 28, 29. 
33. 
Tab. 25, 
30, 31. 
Tab. 22. 
23, 32. 
The Anatomy Book HI. 


gity, than any other in the Wood. In the Wood, I fay 5 for in the Barque, 
there are many Sap-Vefels bigger than the biggelt Aer-Ve/els that be. 
18. §. The Varities hereof are very many 5 in refpect both of their 
Number, Size, and Pofition being, as to thefe, the fame, in no two 
Sorts of Plants whatfoever. Firft in refpect of their Number. So in 
Hazel, Apple, Pear, they are very numerous but in different degrees: 
and are reprefented in the Figures already referred to, by all the black 
fpots in the Wood. In Holly, Plum, Barberry fomewhat numerous, In 
Oak, Afh, Walnut fewer. In Pine, and others of that Kindred, very 
few; fe. fewer than in any other kind of Plant. 
19. §. Secondly, in refpect of their Size 3 which from the firft or 
greateft, to the leaft, may be computed eafily to about Twenty Degrees. 
Thus, many of thofe in Elm, Ajh, Wallnut, Fig,Oak, are very large. In 
Barberry, Plum, not fo large. In Hazel, Sumach, {maller. In Holly, 
Pear, of a {till {maller Size. Sothat many of thofe in Elz, or Ozk, 
are Twenty times bigger, than thofe in Holy or Pear. 
20. §. Inan ordinary joynted Cave, they are fo wide, that if you 
take one a yard, or a yard and ; long,and putting one end into a Ba- 
fin of Water, you blow ftrongly at the other; your Breath will im- 
mediately pafs, through the Aer-Vefels, the length of the Cave, fo.as to 
raife up the Water into a great many Bubbles. 
a1. g. And asthey have a different Size in divers Kinds of Plants 5 
fo likewife, according to the place where they ftand, in the felf fame. 
Soin Holly, Hazel, Apple, their Size is more equal throughout the 
bredth of the Tree. But in Barberry, El, Oak, Ath, very different: 
Not fortuitoufly, but always much after the fame manner. For in all 
the laft named Branches, the Aer-Veffels that {tand in the inner margin 
of eachannual Ring, are all vaftly bigger, than any of thofe that ftand 
in the outer part of the Rimg. 
22. §. Thirdly, thefe Aer-Veféls are alfo different in their Sitwa- 
tion, So in Apple, Wallaut, Fig, they are {pread all abroad in every 
annual Révg; not being pofited in any one certain Lize. In others, 
they keep more within the compas of fome Lize or Lines either Di- 
ametral, or Peripherial. So in Holly they are Radiated, or run in eyen 
Diametral Lines betwixt the Pith and the Barque. So alfo are fome of 
of them in Hazels and fome few in Wallnut. 
23. §. Whether they ftand Irregularly, or are Radiated, it is tobe 
noted, That Nature, for the moft part, fo difpofeth of them, that 
many ofthem may ftill ftand very near the Ixfértions. So in Apple, 
fhe will rather decline making an even Lize 5 or in Holly, will rather 
break that Live into Parcels, than that the Aer-Vefféls fhall ftand re- 
mote from the Ivfertions. To what end this is done, fhall be faid 
hereafter. 
24. §. Again, in Afh, the Aer-Vefels are none of them Radiated, 
but moft of them ftand in Circles on the inner Margin of every annu- 
al Ring. Which Circle is fometimes very thick, asin Ah and Barberry. 
In others but thin, the Vefels ftanding, for the moft part, fingle 
throughout the Circles; asin El. Sometimes again, they both make 
a Cirele, and are alfo {pread abroad 3 asin Pear and Plum. 
25. §. Thofe likewife which are {pread abroad, are fometimes Re- 
gularly pofited. So in Barberry, befides thofe larger, that make the 
Circle, there are other fimaller ones, that ftand, in oblique Lizes, 
athwart 

