n 



rani5 



t\ 



e 



mi 



di 



311 gi 



lira- 



ate 



3n 



5 



h- 



5 the 



) 



tb£ 



r flu- 



's 



^ 



an 



HUTTONIAN THEORY. 



7 



and alfo thofe pudding-ftones or breccias where 



gravel coniifls of q 



In all thefe in- 



fiances, it is plain, that the fand or gravel exift 

 ed in a ftate quite loofe and unconnected, 



t the bottom of the fea, previous 

 bee 



dation 



n into ftone. But fuch bodies of gravel or fand 



could only be formed from the attrition of large 



les, inalfes of quartz, or from the dilTolution of fuch 



; ex. fand-ftone (trata as exift at prefent ; for it will 



)t af. hardly be alleged, that fand is a cryftallization 



)r ol of quartz, formed from that fubftance, when it 



for, palTes from a fluid to a folid ftate. 



Thofe pudding~ft 



which the gravel 



fafe. round and poliflied 



y 



the 



fion ftill 



farther, as fuch gravel can only be formed in th 



und beds of 



or 



the depths of 



knc 

 the 



to 



ft 



y 



the lliores of the fea ; for, 

 ocean, though currents are 

 there can be no motion of 



fufliciently rapid to produce th 



trition required to give a 



d figure 



d 



fmooth furface to hard 



d 



pieces of 



ftone. There muft have exifted, therefore, not 

 dnly a fea, but continents, previoufly to the for- 



r 



mation of the prefent ftrata. 



The fame thing is clearly fhewn by thofe pe- 

 trifadlions of wood, where, though the vegeta- 

 ble ftrudure is perfedly preferved, the whole 

 inafs is ftliceous, and has, perhaps, been found 



A 4 



111 



1* 



