xpo 



ILLUSTRATIONS OF THE 



imputable to him is, that, being led by indue, 

 lion to admit the fnfion of mineral fubflances 



IQ 



ex 



the bowels of the earth, he has affiimed the 

 iftence of fuch heat as was fufFicient for this fu. 

 lion, though he is unable to affign the caufe of 

 it, I believe it will be found, that his fyftem 

 only fliares in an imperfedion, which is com- 

 mon to all phylical theories, and which the ut- 

 moft improvement of fcience will never com- 

 pletely remove. 



169. Thus, then, we are led, it muft be allow- 



e^ion of hypothejis and conjeciure, 



Indeed, 



region, 



i^ho has 



ed 



the 



but by no means into that of chimeras. 

 the reproach of flying into the latter 

 may be faid to come but ill from one, ^ 



trode fo often the crude conjijlence of the chaos, 

 and who delights to dwell beyond the bounda- 

 ries of nature. By fojourning there long, it is 

 not impoflible that the eye may become fo ac- 

 cuftomed to fantaflic forms, that the ficrures and 



proportions of n 

 ed and monllrou 



Ihali appear to it defo 



Note viii. § 24. 



Sparry Jlrucl are of calcareous petr.ifa5lions. 



170. When the fhells and corals in limeftone 



are quoted by mineralogifts, it is not always 



confidered 



