156 BULLETIN OF THE 



be deemed in its nature paroxysmal. It therefore becomes necessary to 

 make a very careful inquiry into the value of the evidence which this 

 case affords as to the speed with which these changes of level were 

 brought about. This problem should be considered by many field 

 geologists. It cannot adequately be solved by one student. On this 

 account, I venture to present the arguments in the case of the Florida 

 lake district, with the hope that they may be carefully reviewed by 

 other students. 



