49^ 



ILLUSTRxVTIONS OF THE 



to alTume the exigence, and again the difappear^ 

 ance of fuch a great quantity of heat, without af- 

 figning fome caufe for the change. 



434. Since, th 



o 



thehypothefis of 



Neptunill 



the Vulcanifts, affords any good 



planation of the figure of th 



earth 



fu 



a one as can 



connect it with the other appear- 

 ances in its natural hiflory, it remains to in- 

 quire, whether the fj^ftem that fuppofes a partial 



Dr Hutto 



and fucceffive fluidity, like 



any refource for explaining this great phe 



h 



non. 



Of 



treated 



fubjed Dr Hutton has not 

 I was firll made acquainted with 

 his fyfiem, it appeared to me a very ferious ob- 



d 



w hen 



jed 



It 



d 



profefs to g 



planation of fo important a fadl 



the obi 



fig 



f the Cc 

 ofelv, h 



On 



fiderinir the 



t> 



I found that th 



principles contained in it from which a very fa 



factory fol 



(and, I think 



ly fat 



fadory folution) of that difficulty might be ded 



ced 



This fokition 1 fhallend 



far. at leafl; 



ITary for the purpofc 



of general illuftration. 



It is 



laid down in Dr Mutton's theory, that 

 the furface of the earth is perpetually changed 

 by the detritus of the land j and that from the 



materials 





ce 



it 



at 



di 



fei 



in 



tr( 



tai 



an 



m' 



be 

 ed 



or 



fa 



4 



ct 

 to 



It] 



, . vr .^ b 4u- Ji 



