86 



ILLUSTRATIONS OF THE 



^ 



the entire 



from the llrud: 



of the elements taken feparately, but of 



conclufion follows 



fs 



This laft 



of thofe fpecimens, where 



of the fubilances is imprelTed by the form 



?r. Thus, in thi 



which are 



P 



r to 



oth 



Portfoy granite *, which Dr H 



h 



a 



fo 



mi 



tely defcribed, the quartz is imprelTed by the 



rhomboid 



ryftals of the feltfp 



d th 



e 



flone thus formed is compaa: and highly confo 



]i dated. H 

 of parts, wl] 



g 



fte 



being feparatelv formed 



were fomehow brought together and aggl 



ted 



but it is certain that the quartz, at lead 



fluid wh 



it 



Ided on the feltfi 



In other granites, the impreffions of the fubilan- 

 ces on one another are obferved in a different 

 order, and the quartz gives its form to the felt- 

 ar. This, however, is more unufual ; the quartz 

 commonly the fubftance which has received 



the impreffions of all the reft 



and the fpiculas of 



fchorl often fnoot both acrofs it and the feltfp 



The 



gred 



f 



fluid 



hen 



g 



d. or at 



ft 



with one another. Now, th 

 the efted of folution 



were therefore 

 when in contad 

 fluidity was not 



in a 



ft 



for 



th 



cafe 



one kind of cryft 



ght 



prefs another, but each of them fliould h 



peculiar fhape 



8 1. The 



■A > 



* Theory of the Earth, vol. i. p. 104. 



