The Power and Ufe of Mixture. Le&.l. 
nor fo much Aqua fortis, and Spirit of Salt, for the prelent, do not at 
all touch it. And Spirit of Nitre it (elf will Not coagulate it, under eight 
or tez hours at leaft. 
INSTANCE VL 
ASTLY, and confequently, It isa Key To Difeover the Medicinal 
‘Ofe and Operation of Bodies, Thus, for Example, by the Imita- 
tion Of Refins and Refinons Gums, we certainly know what all of them 
are, and when, and wherefore to be ufed. For what are Maftick, Fran- 
hincenfe,Olibarum, Benzoin, and other like Rofins, or Refirous Gums, for 
their principle and predominant parts, thatis, qua Rofins 5 but Bodies 
refülting from Natural, in like manner, asI have fhewed, they may be 
made to refult, from Artificial Mixture? That is to fay, the Oleows, and 
Acid parts of Vegetables, being both affufed and mingled together, per 
minima, wfome one fort of Vefels in a Plant, they thus incorporate in- 
to one confiftent and friable Body, which we call Rofin. 
2. $. Now from hence it is, That the (aid Rofins, and Refinous 
Gums as alfo Amber and Sulphur for the fame Reafons 5 are of fo great 
and effectual Ufè againft moft thin and falt Rhewms 5 fe. as they are 
Acidoleous Bodies, For by their Acid parts, which in all thefe Bodies 
are exceeding copious, they mortifie and refraét thofe Salt ones, which 
feed the Rheum. And by their oleows parts, the fame Salt ones are al- 
fo Imbibed. Whence, they are all, in fome degree, incorporated together; 
that is, The Rhen is; thickned: which is the defired effec. 
3. $. Whereas, onthe contrary, if the Cough proceed not from a 
thin, and {pecially a Salt Rheum, but from a Vifcous Flegm; the ufe of 
many other Bodies which are alfo more oleous, and abound not fo much 
with an Acid as thefe do, efpelcially fome of them, is more proper: 
fuch asthefe, in this Cafe, proving fometimes not only ineffedual, but 
prejudicial. Since the very Caufe of the faid Vifeoufaef of Phlegm, is 
chiefly fome great Acidity in the Blood, or in fome other Part, as may 
be proved by divers Arguments. 
4 $. Many more Instances might be hereunto fubjoyned : and may 
hereafter be offered to the acceptance of fuch, who are inquifitive into 
matters of this Nature. Tf 1 {hall not herein anticipate, or reiterate the 
Thonghts and Objervations, of thofe two Accurate and Learned Perfons 
Dr, Willis, and Dr. Walter Needham, as to what the one hath already 
publifhed, and both have put usin Expeéfation of. But the Inffances al- 
ready given, are füflicient to evidence what I have faid. And, I ho 
this prefent Di/conr/é to prove, in fome meafure, thus much 5 That. 
periment, and the Common Notions of Senfè are prolifick; and that no- 
thing is Barren, but Phanfieand Imagination, 
An 
