126 M. Brochant on Mont Blanc. 



5th. That a true granitic formation exists in the Alps on 

 the southern edge of the chain, which, from analogies found- 

 ed on all the facts now received in geology, contributes, 

 with all the preceding characters, to establish the little rela- 

 tive antiquity of the supposed granites of Mont Blanc and 

 the high Mpsy as well as that of the talcose rocks of which 

 it forms apart. 



