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The Power and Ofe of Mixture. Le&.. 
nor fo much Aqua fortis, and Spirit of Salt, for the prefent, do not at 
all touch it. And Spirit of Nitre it {elf will not coagulate it, under eight 
or ez hours at leaft. 

INSTANCE VI 
ASTLY, and confequentl, It isa Key To Difeover the Medicinal 
OU€ and Operation of Bodies. Thus, for Example, by the Inita- 
tion of Rofizs and Refitous Gums, we certainly know what all of them 
are, and when, and wherefore tobe ufed. For what ate Maflich, Fran- 
hincenfe,Olibannm, Benzoin, and other like Rofins, or Refinous Gums, for 
their principle and predominant parts, thatis, qua Rofins ; but Bodies 
refulting from Natural, in like manner, asI have fhewed, they may be 
made to refult, from Artificial Mixture’ Thatis to fay, the Oleows, and 
Acid parts of Vegetables, being both affufed and mingled together, per 
minima, fome one fort of Fefels in a Plant, they thus iacorporate in- 
to one confiflent and friable Body, which we call Rofiz. 
2. §. Now from hence it is, That the faid Rofizs, and Refixous 
Gums, as alfo Amber and Sulphur for the fame Reafons 5 are of fo great 
and effectual Oye againft moft thiz and fal: Rhewms5 fe. as they are 
Acidoleous Bodies. For by their Acid parts, which in all thefe Bodies 
areexcecding copious, they mortifieand refrac thofe Salt ones, which 
feed the Rheum. And by their oleows parts, the fame Salt ones are al- — 
fo Inbibed. Whence, they are all, in fome degree, ixcorporated together 
that is, The Rheum is thickwed: which is the defired effec. 
3. §. Whereas, onthe contrary, if the Cough proceed not froma 
thin, and {pecially a Salt Rheum, but froma Vifcous Flegm; the ufe of 
many other Bodies which are alfo more oleous, and abound not fo much 
with an Acid as thefe do, efpefcially fowe of therm, is more proper: 
fuch asthefe, in this Cafe, proving fometimes not only ineffectual, but 
prejudicial, Since the very Canfé of the faid Vifcoufnefs of Phlegm, is 
chiefly fome great Acidity in the Blood, or in {ome other part, as may 
be proved by divers Arguments. 
4. §. Manymore Instances might be hereunto fabjoyned : and may 
hereafter be offered to the acceptance of fuch, who are inquifitive into 
matters of this Nature. If Ifhall not herein anticipate, or reiterate the 
Thoughts and Obfervations, of thofe two Accurate and Learned Perfons 
Dr, Willis, and Dr. Walter Needham, as to what the one hath already 
publifoed, and both have put usin Expetfation of. But the Inflances al- 
ready given, are fufficient to evidence what I have faid. And, I hope, 
this prefent Di/courfé to prove, infome meafure, thus much ; ThatEx- 
periment, and the Common Notions of Senfe are prolificks and that no- 
thing is Barre, but Phanfieand lwagination. 

