88 DOMAIN in. ARGILLACEOUS. 



rounded, and have evidently lost their angles by 

 friction ; others have all their angles sharp ; some 

 even have that rhomboidal form that those kind of 

 rocks so often affect. In those parts of the rock 

 where these pebbles are imbedded in great quan- 

 tities, the elements of the schistus have not had 

 room to arrange themselves, and form parallel 

 laminae ; but every where, where the stones leave 

 between them sensible intervals, the laminae re- 

 appear, and are constantly parallel, both with one 

 another and with the planes which divide the beds. 

 " The mass of these schistose pudding-stones 

 constitutes a thickness of near 100 fathoms in the 

 mountain, reckoning from east to west across the 

 beds ; and I traced it in the direction of its length, 

 for more than a league : it cannot be traced far- 

 ther, because the beds hide themselves, and are- 

 buried under the earth. 



" Above these pudding-stones, to the south, 

 slate is found, of which the beds are rather less 

 inclined, and the direction a little different ; they 

 tend some degrees more to the east, like those of 

 Col de Balme, but they lean to the same side, as 

 thos,e among the beds of pudding-stones, which 

 are not quite vertical : they lie towards the west. 

 " In continuing to ascend, thin beds of sand- 

 stone are found above the slates, which have the 

 same situation and inclination with these last. 



