

LETTER OF TRANSMITTAL. 



University of Chicago, March 13^ 1901. 

 Sir: I have the honor to transmit herewith the manuscript of a mono- 

 graph by Mr. Frank Leverett on the Pleistocene geology of the region 

 between the Ohio Valley and the Great Lakes. This is the second con- 

 tribution of Mr. Leverett to the series of monographs in course of prepara- 

 tion on the glacial formations of the Northern States, and is a fit companion 

 to his Monograph XXXVIII, on The Illinois Glacial Lobe. The plan of the 

 monograph and the method of its development are essentially the same as 

 those of its forerunner. As in the preparation of that volume, our working 

 relations have been of the most intimate kind, and I join with the author in 

 the hope that it may prove an acceptable contribution to the Pleistocene 

 problems of the United States. 

 Respectfully, yours, 



T. C. Chambeklin. 

 Hon. Charles D. Walcott, 



Director of United States Geological Survey. 



