THE WORK OF RUNNING WATER. 



145 



above their surroundings in the late stages of an erosion Cycle (Fig. 124) 

 are known as Monadnocks, the name being derived from Mount 



Figs. 128-30. — Diagrams to illustrate piracy, where the competing streams all cross 

 a hard layer. The diagrams represent successive stages of development. 



Monadnock, N. H., an elevation of this sort developed in a cycle ante- 

 dating the present. 



