
Book Il of Roots. 63 
19, g. Oftentimes thefe Succiferous Vefféls yield a Milky or White 
Sap and fometimes. Yellow,and of other colours as in Souchus,and moft 
Cichoraceous Plants 5 in Angelica, and molt Umbelliferous 5 in Burdock; 
and divers Thiffles, to which that is ’akin: in scorzonera, Common 
Bells, and many other Plants, not commonly taken notice of to be 
milky. The Milky Saps of all which, although they differ in Colour, 
Thicknefs, and other Qualities 5, yet agree, in being more Oyly than 
any of the Lyphous Saps. It being the mixture of the Oyly parts with 
‘fome other Limpid Liquor, but of a different Nature, which caufeth 
them to be ofa Milky, or other Opacons Colour, in the fame manner 
as common Oy/, and a {trong Liquamen of Tartar, fhaked in a Bottle 
together, prefently mix into a White Liquor. And although they 
will, for the greateft part, feparate again 5 yet fome of their parts, 
without any Boiling, or fo much as the leaft Digeftion with Heat, by 
Agitation only, or {tanding together for fome time, incorporate in the 
form of a Thin Mélky-Sope, which will al{o diffolve in Water. I fup- 
pofe, therefore, That it isthe Volatile salt, chiefly, of thefe Plants, 
which being mixed with their Oyl, renders this Liquor of a White or 
other Opacous Colour. . 
20. §. Sometimes the Oy! will feparate and difcover it felf: for if 
you cut a Fewil-Root traverfe, after it hath layn fome days out of the 
Ground ; the fame Vefels, which, in a frefh Root, yields ag/k 5 will 
now, yield Oyl: the watery parts of the Mzlk., which in the dry- 
ing of the Rost are more evaporable, being fpent. 
21. §, All Gums and Balfams are likewife to be reputed the proper 
Contents of thefe Veféls: for Thefe and Milks, are very near akin. 
So the Milk of Feril, upon ftanding, turns to a Clear sal/am 5 of 
Scorzonera, Dandelion, and others, to a Gu. In the dryed Root 
of Angelica, &c. being {plit, the Milk, according to the Continuati- 
on of thefe Veféls, appeareth, as Blood clodders in the Veixs, con- 
denfed toan hard and fhining Rofiz. And the Root of Heleninm cut Tab. 9: 
tranfverfely, prefently yields a curious Balfame of a Citrine Colour, 
and fometimes of the Colour of Balfame of sulphur. 1 callit a Bal: 
fame 5 becaufe it will not diffolve in Water. Yet not a Terebioths 
becaufe, nothing near fo vifcid or tenaceousas that is, But the Root 
of Common Wormwood, bleeds, from large Veffels, a true Terebinth, or a Téb. 19. B: 
Balfame with all the defining properties of a Terebinths although that 
word be commonly ufed only for the Liquors of fome Trees. 
_ 22. §. There is yet another kind of Sap-Veffels, which may be cal- 
led Vaponr-Veffels 5 as in Docks, at leaft fome of them. For by the 
Sap-Veffels it is, that the Barques of Roots do Bleed. Of which, fome 
Bleed quick and plentifully, asthe Umbelliferous and the Cichoraceows 
Kinds. Some, very flowly and {carce vifibly, as all or moft Trefayls; 
and of the Legumiinons Kind. And fome feem not to Bleed, as the 
Dock, Yet that this Root, hath alfo Vefels diftin& from thofe that 
carry Aer; doth partly appear; from the different Colour they pro- 
duce where they ftand5 as will better be underftood anon; in fpeak- 
ing of the Caufes of the Colours of Roots.As alfo from the Toughnefs 
of the Barque, in pulling it by the lengths neither the Parenchyma, 
nor the Aer-Vefels, being of themfelves Tough. But becaufe the Swccus 
or Sap they carry, {eems to be a kind of Dewy Vapour, therefore, they 
may not iniproperly be called Roriferous = Vapour-Veffels. 

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