714 



ROLLIN D. SALISBURY 



course of the river, in the one case (Fig. 4), is often mistaken for a 

 mark of age. 



Special names for the types of youth illustrated by these two 



Fig. 4. — A type of youthful topography, from the Fargo, N. D., to Minnesota 

 quadrangle. Scale, about two miles to the inch. 



areas would be useful. If the type of topography represented in 

 Fig. 5 be regarded as that of normal youth, that shown in Fig. 4 

 should be designated by some quahfying adjective. No fitting 



