(iS) 

 Phyfical Wnters call SECOND §VA* 

 LVIIES^ and which yet, as they may be 

 produced and destroyed by the Chymitts 

 Art, may be fti'ed Chymical Qualities* and 

 the Spagyrical ways of introducing or ex- 

 pelling them may be referr'd to Chymical 

 Operations* of which there is given a more 

 ample Specimen in the Mechanical account 

 of Chymical Precipitations. And laftiy, 

 fome Notes are added about Magwtifinand 

 l&ltttricity, which are known to belong to 

 the Tribe of Occult ^alitier. 



IV. If a want of apt Coherence and 

 exa& Method be difcover'd in the follow- 

 ing EflTays, ? tis hop'd , that defect will 

 be eafily excus'd by thofe that remember 

 andconfider, that thefe Papers were ori- 

 ginally little better than a kind of Rapfo- 

 dy of Experiments, Thoughts, and Ob- 

 fervations, occafionally thrown together 

 by way of Annotations upon fome PaiTa- 

 ges of a Difcourfe, ( about the differing 

 Pattsand Redintegration of Nitre) there- 

 in fome things were pointed at relating to 

 the particular Qualities that are here 

 more. largely treated of. And though ths 

 Particulars tint concern fome of thefe 

 Qualities;, were afterwards ( to fupply the 

 place of thofe borrowed by other Papers 

 . whilft thefe lay by me ) increased in num- 

 ber j yet ic was not to be expedied y thn 



their 



