( 4i6 ) 
by thefe Concretions the connate Jcidum fo combines with the 
SulphttroHS parts it clofeth with, as that both pafs into di tertium 
qi4id, or neutral refulr, partaking of both, and yet diftinguifli- 
able by neither infoniuch that the Acidum by fuch fort of 
coagulations and concretions loofes its fting , and becomes al- 
together unperceivable : Whence he draws the reafon , why, 
though Acids be the very foundation of all coagulations and 
concretions of bodies, yetare themfelves to our tafte in many 
things the leaft difcoverable : Which' particular he endeavours 
to make out by mixtures, refembling the natural^ feeing 
we cannot eafily get to the infides of bodies in their natural pro- 
^uftions. 
As to his difcourfc of the Sulphur -Bath KnArsborough 'm 
Torkjhire^ concerning its Caufes and Pertucs , we fhall refer the 
•Reader to the Traft it felf. 
Errata in A^i^w^. r i6. 
In the Contents 1. J.r. hleak^ for blacky noting the fame p.3 57.1.4,and 2 3. 
ip,^'y'j,],numb.jyp. for 17 5, p,^6o. h6,x.triture^ot mixture^ p.3d2.I.i5. 
Tjah^ the better, {b\^X\At,x,wor\^ ip*^6^,].2i,r,7valkjngjpeedj ibid.l.25». 
-x,from the fteepefh ^ 
N.B. in Numki 12. p.273.1.3 and 4.read, U hy the Cycloid : wfiichjUpon 
a fre(h perufalof that Extra^^ we took notice of, though too late. 
L O N D O iV, 
Printed for John Mmjn^ Printer to the V.ejiil Setiet^. 
