
Book III. of Tranks. 137 

6, §.. Wherefore, Convolvula's do not wind by any peculiar -Na= 
ture or Genius, which other Truvks have not; but becaule their Parts 
are difpofed fo, as to render them more {equaceous to the external 
Motor. Even as the Clafpers of a Vine, having the like Strudfure, have 
alfo a Motion of Convolution : whereasthe Branches themfelves upon a 
contrary account, move in a ftraight Line. 
7. §. The Convolution of Plants,hath been obferved only in thofe that 
Climb. But it feems probable, that many others do alfo. minds. in 
which, the main Stalk, is as the Axis to the Branches round about. Ofp , p 
which number, I conceive, are all thofe whofe Roots are. twifted 5 a Ch Suen 
Motion we obferved in fpeaking of the Root. . Whether it be fo, or” * 
not the Experiment may eafily be made by tying.a Thyed upon any of 
the Branches 5 fetting down the refpeé it then hath to any Quarter in 
the Heavens : for, if it fhall appear in two or three Months, to have 
changed its Situation towards fome other Quarter 5 it is a certain proof 
hereof. And that hereby the Roots of many Plants become twifted 5 
the Motiox beginning in the Stalk, and ending at the bottom of the 
Root, which ftands always fixed in the fame place. 
8. §. The Convolution of Trunks, is made not one; but divers ways 5 
fome moving by South from Eaft to Weft 5 and others fromWef? to Eaft. 
Wherefore it feemeth, that as the Efficient Caufe of Convolution, is not 
within the Plant, but external: fo alfo, that it isnot Ove,but that there 
are Two Great Efficients of this Motion; fe. the Suz and the Asoon. 
Some winding together with the Suz, in its Diurnal Motion, ( or, if the 
the Earth moves, then, Inclining to the Su) by South from Eaf to 
Weft. i others winding with the A4Zoon; in its Monthly Motion, from 
weft to Eaft. 
f $. i pofiibly, may alfo be one fen/ible way of diftinguifhing 
betwixt Solar; and Luzar Plats, Thus far, in genetal, of the Motions 
of Trunks. 

CG Hieks Vali 
Of the Nature of Timber of Trunks, as they 
ferve for Mechanick Ufe: 
@H1E laft thing I purpofed to {peak of, is; Thole 
feveral Qualities of Timber or of Trunks, by which 
they are fitted for Mechanical Uje. As Harduefi; 
“ Sofineli, Fafinefs, Clevefomenefs, Toughness, Brittle- 
nefs, Durablenefs, or any of the fame Qualities 
4, compounded, The Vifible Caufés whereof are ob- 
iS * fervable, Partly, in the Struéfure of the feveral 
Parts fe. the Infertions; sap-Veffels and Aer-Veffels sas to the Nun- 
ber, Size, or Pofition of any of them. And partly, in the Nature of 
the Parts ; I mean {uch as is wanifeft to fenfe. According to our clear 
and diftin& obferving of all which Caufes, we may underftand, 
Wherefore any Wood is made ufe of for any certain purpofe. And 
alfo; wherein fitly to apply it tofurther Ofe. In order to which; 2 
Aa compleat 


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