556 Journal of the Asiatic Society of Bengal. [November, 1910.] 



channels where work is now proceeding, either of which may 

 form the main stream of the Kirtinassa, if it again proceeds to 

 break south. 



Finally I would close this descriptive paper by a ques- 

 tion of potamological theory. Do not the changes described 

 above militate against the theory of the rivers of the lower 

 delta building up ridges on which to run until they finally drop 

 over the edge and commence to raise for themselves a fresh 

 ridge and so on ad infinitum ? It is a fact of some note that in 

 the area under discussion, the oldest lands which the rivers 

 must have deposited several centuries ago, are considerably 

 lower than many of the new char lands which have been formed 

 by the gradual recession of a river ; and it is a fact still more 

 worthy of note that none of the great changes described can 

 by the widest stretch of the imagination be ascribed to this 

 ridge theory. The theory does not afford a satisfactory 

 explanation of the method by which the mouth of the Meghna 

 is being filled up, nor of the formation of the new lands and 

 rivers in the remainder of the area. 



