620 HENR Y S. WA SHING TON 



this would be less vital in many cases than may be thought by 

 some. Cases of uncertainty as to the position and relationships 

 of a particular rock will occur, but presumably less frequently 

 than under the present system. These and other difficulties 

 will have to be met and overcome. But, as Iddings, Brogger, 

 and others have urged, the time is at hand for a revision and 

 change of our whole system of classification and subsequently 

 of nomenclature, and it is well to remember the general truth of 

 the saying, " C'est le premier pas qui coiiie." 



Henry S. Washington. 



