E 40 [y Parts of Plants mixed Lea. IL 
kind of hiffing and fometimes a crackling noife, 4. Effervefeence; then 
only and properly fo called, when they produce fome degree of heat. 
5. Exbalation ; when not only fumes, but vifible fteams are produced, 
7. $. Ofall thefe, fometime one only happens, fometimes two or 
more are concomitant. Sometimes the Luéfation begins prefently upon 
mixture, and fometimes not till after fome intermiflion. 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 Oyl 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, &c. we fhall find, that they are, 
generally far lefi apt to make a Luitation, than either Animal, or fubterra- 
neal Bodies. Whence, as from one argument, it feemeth evident, That 
in molt Vegetables, and in moft of their parts, the predominant Salt is 
an Acid. But that, on the contrary, the predominant Salt in molt 
Minerals, and parts of Animals, is an Alkaly : in the former, ufially 
a fixed; inthe latter, a volatile Alkaly. 
9. $. Again, although the Luétation which moft Vegetables, and moft 
of their parts make with Acids, be but fmall, 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 watural eftate 5 and that it is not made Alkaline, but 
only Lixivial, by the fire. Or, there is fome quantity of a Salt, call 
it what we will, in the faid Bodies, which is fo far different from an A- 
cid, as to makea Luctation therewith. But to give particular inftan- 
ces of the feveral proportions, or manner of Mixture, wherein it ap- 
pears tobe in feveral Plants. 
10. $. And frf, of all vegetable Bodies, Date-flones are amongf the 
leaf? apt to make a Luctation with Acids,if they may be faid to make any at 4 
all. Hence they are not fo potent Nepbriticks, as many other Stones, ! 
which make a more fenfible Luéation. 
11. $. Ginger makes a fmall Bullition with Aqua fortis, only obferva- 
ble by a Glafs. Hence the pungency of Ginger lyeth in a fulphureous and 
volatile Salt, which yet is very little Alkalizate. x 
12. $. Scurvygrafi-fèeds make a very finall Bullition with Aqua fortis, a 
Like that of Ginger. So doth alfo the Seed of Purflane. Hence, although 3; 
there ismuch more of a certain kind of volatile Salt in Ginger or 
Scurvygraß, than in Purflane 5 yet there is little more of an Alkaly in p 
any one, than in an other. & 
13. $. The Pulp of Colocynthis, Fruit-Stones, the flony 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 Cathartick power of Colocynthis lieth not fo much 
in an Alkaly, asan Acid; as making a much iefs Bullition, than fome 
other vegetable Bodies, which are lef Cathartick. For which reafon 
likewife it is, That the beft Correétors, or Refradtors of the force of 
Colocynthis, 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 buff, in a fhort time. Hence, the Caufe of a durable Heat, upon the 
Tongue, isan Alkalizate Sulphur, For the Heat of Ginger, though 
greater 
