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HUTTONIAN THEORY. 



207 



.way 



None of the pebbles is drawn out of its 

 focket, that is, out of the cement that furrounds 

 it, but is divided in two with a very fmooth and 

 even fra6lure. The pebbles, in the inftances 

 which I have feen, were of quartz, and other 

 fpecies of primary and much indurated rock. 



Lord Webb Seymour and I obferved pud- 

 ding-ltone rocks, exhibiting inftances of this 

 fmgular kind of fracture, near Oban, in Argyle- 

 Ihire, about three years ago. The phenomenon 

 was then entirely new to us both ; but I have 

 iince met with an inftance of the fame kind in 

 Sauflure's laft work. As the fad is of fo par- 

 ticular,a kind, I fhall flate it in his own words : 

 The place was on the fea-fhore, near the little 



f Alaffio. bet 



Nice and Geno 



" En paffant entre ces blocs de breche, j'ad- 

 mirai quelques-uns d'entr'eux, d'une grandeur 

 confiderable, et tailles en cubes, avec la plus 

 parfaite regularite. II y avoit ceci de remar- 

 quable, c'eft que Paction de la pefanteur, qui avoit 

 taille ces cubes en rompant leurs couches, avoit 



coup 



des breches a fleur de 



furfaQe de la pier re, auffi nettement que ii 



affe moll 



qu 



eut tra 



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verti- 



calement avec un rafoir. Cependant parmi ces 

 cailloux, la plupart calcaires, il s'en trouvoit de 

 tres durs, de petrofilex, par exemple, meme de 



jade, 



! 



