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Paris of Plants mixed Lead. IF 

kind of hiffing and fometimes a crackling noife, 4. Ejferve/cence; then 
only and properly fo called, when they produce fome degree of heat. 
5. Exhalation ; when not only fumes, but vifible {teams are produced. 
“7, g. Ofall thefe, fometime one only happens, fometimes two or 
more are concomitant. Sometimes the Lwéation begins prefently upon 
mixture, and fometimes not till after fome intermiffion. In fome bo- 
dies, it continues a great while; in others, is almoft inftantaneous: 
Examples of all which I fhall now produce 5 beginning with Vegetables, 
as affording the leaft variety. 
8. §. And firft, if we take Spirit or Os! of Salt, Oyl of Vitriol, Spirit 
of Nitre, or Aqua fortis, and pour them feverally upon the feveral parts of 
Vegetables, as Roots, Woods, Stones, Gc. we {hall find, that they are, 
generally far left apt to make a Lutation, than exther Animal, or fubterra- 
neal Bodies. Whence, -as from one argument, it feemeth evident, That 
in moft Vegetables, and in moft of their parts, the predominant Sait is 
an Acid. But that, on the contrary, the predominant Sa in moft 
Minerals, and parts of Animals, is an Alkaly : in the former, ufually 
a fixed inthe latter, a volatile Alkaly. 
g. §. Again, although the Luttation which moft Vegetables, and moft 
of their parts make with Acids, be but fisall, yet fome they make 5 efpeci- 
ally with fome Acids, as with Spirit of Nitre and Aqua fortis. Whence 
it feemeth plain, That there isan Alkaline Salt exiftent in many Vegeta- 
bles, even in their #atural eftate 5 and that it is not made Alkaline, but 
only Lixivial, by the fire. Or, there is fome quantity of a Saif, call 
it what we will, in the faid Bodies, which is fo far different from an A- 
cid, as tomakea Lyation therewith. But to give particular inftan- 
ces of the feveral proportions, or manner of Mixture, wherein it ap- 
pears to be in feveral Plants. 
10. §. Aud firft, of all vegetable Bodies, Date-ftones are amongft the 
eo apt to make a Luttation with Acids,if they may be faid to wake any at 
all, Hence they are not fo potent Nephriticks, as many other Stones, 
which make a more fenfible Lncation. 
11. §. Ginger makes a fisall Bullition with Aqua fortis, only obferva- 
ble by @ Glafs. Hence the pungency of Ginger lyeth in a fulphureows and 
volatile Salt, which yet is very little Alkalizate. 
12. §. Scurvygrafs-feeds make a very finall Bullition with Aqua fortis, 
like that of Ginger. So doth alfo the Seed of Purflane. Hence, although 
there is much more of a certain kind of volatile Sale in Ginger or 
Scurvygrafs, than in Purflane 5 yet there is little more of an Alkaly in 
any one, than in an other. 
13. §. ‘The Pulp of Colocynthis, Fruit-Stones, the ftony Covers of 
the Seeds of Elder, of white Bryony, of Violets, and others, with Aqua 
fortis make a Bullition juft perceivable without a Glafs. Hence it ap- 
pears, That the great Gathartick power of Colocynthis lieth not fo much 
in an Alkaly, asan Acid; as making a much lefs Bulition, than fome 
other vegetable Bodies, which are lefs Cathartick, For which reafon 
likewife it is, That the beft Correctors, or Refractors of the force of 
Colocyxthis, are fome kinds of Alkalies, as particularly that of Urine, 
as Riverins hath fomewhere obferved. 
14. §. The Root of Pyrethrum, with Aqua fortis, makes a Bullition 
and huff, in a fort time. Hence, the Gaufe of a durable Heat, upon the 
Tongue, isan Alkalizate Sulphur. For the Heat of Ginger, though 
greater 5 

