To the Reader," 
tmes afcend in the forme of Steams % fion» 
whence maf be probably deduced not only 
diners of the Medical Vertues of fach Uones^ 
but fume of their other ^alities, as (Zo* 
lour, Weiglit, and alfo explained^ 
How it may happen what He hath (and, he 
doubts not-, others may have alfo) obfervcd, 
of Stones of another kind, or Marcafites, 
or even Vegetable and perhaps Animal fub- 
fiances y^that have been found inch fed in 
folid Stones: For, thefeSubJlancesmay ea- 
fily be conceived, to have been lodged in the 
Earth, whilff it was but OHineraL Earth or 
Mud ; and afterwards to have been, as 
‘twere, cafed up by the fuper- 
Agents that 
Vohit vMo-pervaded itH 
fopher was 
piealed to leave with the Publifliet a.ManHjcYipt of his 
compofure, now ready to be Printed^which he affurM him" 
it had been feveral Years ago. 
Hor are thefe Petrefcent liquors the only 
ones,to which he fuppofeth that many Fofjils 
fnay owe their Origin, ftnce he thinks, there 
may be, (if one m&y fo Jpeak) both Metal- 
lefcent Mineralefcenty^«j'r« in the 
bowels of the Earthy and that fometimes 
