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HUTTONIAN THEORY. 



333 



which may have rendered the parallelifm of th 



plates of granite which 



pofe the aiguilles 



more accurate in appearance than in 



ity 



when view* 

 fummit of Mont Bla 



d from a point fo 



d as the 



For, even on the fup 



pofition that the comparifon of thofe plates to 

 leaves of artichokes wasjufl, and that the planes 

 of their feparation converged toward one ano- 



th 



m 



fcending to the top, when they 



wed from a point mol- 



ted than that 



/ 



top, this convergency would be diminifhed, and, 

 by the force of the perfpedive, might even be 



into parallelifm. We cannot at pre- 



converted into 



fent afcertain what effed this caufe of deception 

 may have adually produced. 



. The obfervations of Sauffiire concerning 

 the ftratification of granite, are not, however, in 

 all inftances, liable to thefe objedions ; and it 

 feems to be on much lefs exceptionable grounds 

 that he pronounces the granite of St Gothard to 

 be llratified. The gneifs and micaceous fchillus 

 which conftitute the lower part of that mountain, 

 are fucceeded by a granite without any fchiftofe 

 appearance, but divided into large plates, exadly 

 parallel to the beds of the former gneifs. Thefe 

 he regards as real ftrata. On fludying them in 



f 



detail, he fay 



fiderab 



g 



were 



be obferved, but not greater than in the cafe 



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