GEOLOGICAL SCIENCE. 7 



bering that she can only be understood by him whose 

 mind can alike apprehend the parts and grasp the 

 whole. But it is his duty also to recollect, that, by 

 premature generalization, he may obstruct his own 

 progress and that of his Science. To fill a blank is 

 tempting: but a vacuity is often preferable to a 

 blank badly filled. The imperfection is less sensible 

 than the defect; while it is apt so to establish itself 

 as to be with difficulty discarded. 



