} ( 7«^ ) 
folutioH of the parts that cornpofe them^ and by freeing thetn of 
the impurities which our fenfes perceive not, whereby the pure 
fubftances, which are the principal and tnoft effential parts Joe- 
ing difengaged, may with more efficacy and fpeed produce the 
effeft looked for* And this is performed in three Books, ac- 
cording to the three, lately named^ clafTes of Materials. In ihe 
doing of which the Author affirms , that his chief aim being 
to make known the fureft and che eaffeft means of fuccefsfully 
performing al l Chjfmical Operatu^s ^he doth fincGrGly communi- 
cate what himfelf prafticeth, without any referve, and endea- 
vours fo to explain himfelf in thofe Preparations that have 
paffed through his hands, that by making thofe to be well un- 
derftood,ic will not be difficult to fucceed in fuch as he hath 
noc fpokenof. And he hopes, that, having in his faid Prepara- 
tions confulted'Experienceund Reafon , and avoided affefted 
prolixities, he fliallnot be blamed for fodoing,and that it will 
be well taken, that he hath eftablifhed their vertues, dofes and 
tjfes upon the principal parts of which che Mixtsarecompofed, 
the feveral alterations which they receive in preparing 
them, and che SucceflTes which he hath noted of them in 
tlie feveral ufcs he has made of them in very many occafions. 
Advertifement , 
7ointm/ite ^ that the Publtfber of this trail intends to tafy 
another offortunity of Jupfying himjelf againjl the Jferfms 
and Calumnies of an immoral Pcflfcrift put to a Bookjalled Lam- 
pas, fublifht by Robert Hooke : till which time , hoped^ the 
Cjwdid Reader wiUJuJpend ha Judgment. 
Errat. Pag.68$.lin.5.1cg. KPL pro KLP. 
Imprimatur, 
1676. 
Bmnck^r^ P.R.S. 
London, Frintedfor]. Martyn, Printer to theK,Socictyyi6'j6. 
