MAPS AS GEOGRAPHICAL ILLUSTRATIONS 513 
the neck of the spur. Just above Berncastel, the narrowing of 
the necks of the ancient spurs has been carried still further, and 
two of them are cut through by the river; the abandoned mean- 
ders being now distinctly traceable in flat meadows that curve 
around the isolated extremities of the spurs. Sheets 503, 504 
include several of the maave in the volcanic district of the Eifel. 
These and other grouped sheets have been so instructive and 
profitable, both in studying and teaching, that I urge their use 
upon students and teachers of physiography in normal schools 
and colleges. They furnish numerous examples of well defined 
physiographic features, and thus serve to extend the fund of 
geographical types and illustrations far beyond the narrow 
limits within which the subject is usually carried forward from 
early school years. On some future occasion I hope to present 
briefer notes on a larger series of grouped sheets, to give further 
indication of the richness and variety of easily accessible mate- 
rial of this kind. 
W. M. Davis. 
HARVARD UNIVERSITY, 
Cambridge, Mass. 
