226 M. R. CAMPBELL — EROSION AT BASELEVEL. 



theory regarding the operations of erosion during the closing stages of a 

 cycle will need to be considerably changed, and likewise the generally 

 accepted idea of the ultimate result will also suffer some modification. 

 While our present knowledge of the processes involved is too slight to 

 warrant more than mere suggestions, the subject is an attractive one and 

 is certainly worthy of careful study, both regarding the chemical opera- 

 tions involved and the effect upon physiographic forms. 



