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1S) 
The Colours Lea. V. 

17. §. Férft, What was faid before, is to be remembred, that here 
the Aer js not a folitary, but concurrent Caz/é. So that befides the © 
Efficacy of this, we are to confider that of the feveral parts of the Plant, 
by which the Contents both Aereal and Liquid are fupplied to the 
Flower. 
18. §. Secondly, Thatin the Lympheduils of a Plant, Sulphur is 
the predominant Principle,and much more abounding than in any other 
part of a Plant, asalfo hath been formerly fhewed. 
19. -§. Thirdly, That it appears,according to what we have obferved 
inthe Anatomy of the Flower, That the quantity of Lympheduds with 
refpect to the Aer-Veffls is greater in the Flower than in the Leaf; 
20. §, Itfemeth therefore, that the Aer-Veffels, and therefore the 
Aer, being predominant in the Leaf; Green, is therein alfo the predo- 
dominant Colour. 1 fay predominant, becaufe there are other Colours 
lye vailed under the Gree#, even in the Leafe, as will hereafter appear 
more manifeft. ; 
21. §. Onthecontrary, the Lywpheduéfs, and therefore the sul- 
phur, being more, and the Aer-Vefels and therefore the Aer, lefs, in 
the Flower than inthe Leaf’; the ambient Aer alone is not able to con- 
trole the Sulphur fo far, but that it generally carrys the greateft port 
in the Produéfion of the Colour. Yet in different degrees; For if 
the proportion betwixt the Lymaphadutts and the Aer-Vefféls be more 
equal, the Flower is either White or elfe Yeow, which latter Colour is 
the next of kin toa Greew. If the Sulphur be fomewhat predominant, 
the Flower will thew it felf Red at firft; but the ambient Aer hath fo 
much power upon it, as gradually toturn the Redinto a Blem. But 
if the Sulphur be much predominant, then the Acid of the ambient Aer 
will heighten it to a fixed Red. i 
22. §. Hence it is, that Yellows and Greens are lef3 alterable, upon 
the drying of Plants than other Colours /c. Becaufe the Aer being pre- 
dominant im their Production, they are the lef lyable to faffer from it 
afterwards. Whereas Reds and Purples, in the Produifion whereof 
Sulphur is predominant, are very changeable. Sothe Red Flowers of 
Lyfimachia, wpon drying, turn Purple, and the young purple Flowers of 
Slofs turn Blew. Solikewife the Purple of Bilberries, and the Crim{on 
of baked Damajcens, both turn Blew. For being gathered, and fo wan- 
ting a continued fupply of freth Suiphar, to bear up the Colour againft 
the force of the Aer; it {trikes it down at laft from Red to Purple or 
Blew. conclude therefore, that one Prixcépal Canfé of the Variety of 
Colours in the Flower, is the over proportion of the Lymphedué#s to 
the Aer-Vefels, and therefore the dominion of the ‘Sulphur over the 
Aer, therein. ; 
23. §. Ifit be objected, that the Aer doth not deepen, but highten 
the Colour of the Blood: 1 anfwer, Firff, That I am not now {peaking 
of Avimal, but of Vegetable Bodies 5 the fame Aer which hightens the Co- 
four of Blood one way, may deepen that of a Flower, another: nay and 
may highten that of fome Flowers too, fome other Way. 
24. §. And therefore, Secondly, it is to be confidered, That as 
there is not one only, but divers Salize Principles in the Aer; {0 are 
there alfo in the feveral Parts of one Plant 5 as in the Root,of one fort ; 
in the Leavs, of another ; inthe Flower, of another; and:fo in the 
other Parts, For fince the Figuration of the Parts of a Plant dependeth 
chiefly 

