146 THE JOURNAL OF GEOLOGY. 



periods during which all the Ohio moraines, no less than twelve 

 in number, were being formed. 



The decision as to the relative length of the intervals of 

 deglaciation is obviously dependent upon data gathered from the 

 entire glacial field, and should not be rendered in the light of 

 what can be gathered from this limited region. 



Frank Leverett. 



