TOMPKINS COUNTY. 
299 
in the dip of the rock, so that it must cover the whole of the south portion of the county. In 
-an economical point of view, the question of the Ithaca and Chemung groups involves no con¬ 
sequences of any importance whatsoever. Their interest is as regards classification, which 
forms, as it were, the fulcrum to the lever of the human mind; and the more firmly the 
former is planted, the more steady are the operations of the latter, and the higher will be its 
achievements. 
