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Book IV. 
A 
DISCOURSE 
Read before the 
ROYALSOCIETY 
Decemb. 10. 1674» 
Concerning the 
NATURE, CAUSES, and POWER 
MIX TURE. 
AVING the honour to perform the Task of 
jj} this day 5 I fhall endeavour to conform to the 
Phylofophy, which this Society doth profes; 
which is, Reafoning grounded upon Experiment, 
and the Common Notions of Senfe. The former 
N ‘i being, without the latter, too fubtle and intan- 
|| gible; the latter without the former, too grofs 
and unmanageable: but both together, bearing 
a true analogy to.our felves 5 who are neither 
Angels, nor meer Animals, but Men. 
The Subject I have chofen to fpeak of, is Mixture. Whereof, that 
our Difeourfe may be the more confiftent, and the better intelligible 5 
all I have to fay, (hall be ranged into this Method 5 viz, 
1. Firft, I fhall give a brief account of the received Doéfrine of 
Mixture, 
2. Next, lay down fome Propofitions of the Principles whereof all 
Mixed Bodies confitt. 
3. Then, open the true Nature of Mixtures or fay, What it is. 
a And thenenumerate the Canfes of Mixture, or fay, How it is 
made. 
5. Laftly, 1 fhall hew the Power of Mixture 5 or, What it can do, 
CHAP. 
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