HUTTONIAN THEORY. 



S5 



tile 



■)k 



t\ 



I 



nent parts are ufually found. 



This c^ryftalliza 



tion is particularly to be remarked of the felt- 

 fpar, and alfo of the fchorl, where there is any 

 admixture of that fubftance, whether in flender 

 fpicula2, or in larger maiTes. The quartz 



itfelf 



fo 



cafes 



yftallized, and 



perhap 



more frequently than is generally fuppofed 



The fluidity of g 



o 



f 



ite 



is fo 



d 



fome former period 

 ;nt from this, as to 

 make it appear lingular that it fhoald ever have 

 been confidered as a foilil that had remained al- 

 ways the fame, and one, into the origin of which 

 it was needlefs to inquire. If the regular forms 

 of cryilailization are not to be received as proofs 



of the 

 pafTed fi 



fubftance to which they belong having 



fluid to a folid Hate, neith 



the figures of fnells and of other fuppofed petri- 

 fadions, to be taken as indications of a paiTage 

 from the animal to the mineral kingdom ; fo 

 that there is an end of all geological theories. 



and of all reafonings concerning the ancient 



condition of the globe. To an argument which 

 llrikes equally at the root of all theories, it be- 

 longs not to this, in particular, to make any re- 

 ply. 



80. We iliall, therefore, confider it as admit- 

 ted, that the materials of the granite were ori- 

 ginally fluid ; and, in addition to this, we think 

 it can eafily be proved, that this fluidity was 



F3 



not 



'^. 



\ 

 ^ 



