Ann Arror, Michigan, 

 April 12, 1894. 



GROVE KARL GILBERT, 



S. GEOLOGICAL SURTKT, 

 WASUINOTON, D. C. 



My Dear Sir : — 



It is now fourteen years since you first guided my footsteps to the beaclies of Lake Bonne- 

 ville and pointed out tlie striking contrasts in the sculpturing of the mountains above and below 

 the horizon to which that ancient sea flooded the now desert valleys of Utah. For several years 

 after the survey of Utah's former lake was completed, you directed my studies of the ba.sins of 

 .similar lakes in Nevada, California, Oregon, and Washington ; and through your advice and 

 suggestions I was enabled to see many things that otherwise might have escaped notice. 



While writing this little book, which so inadequately describes some of tlie most interesting 

 events in the later geological history of North America, I have made more use than I could well 

 acknowledge of your volume on Lake Bonneville and of your more general discussion of the 

 Topography of Lake Shores — books that are numbered among the classics of American geology. 



As a partial acknowledgment of this accumulated indebtedness, I beg to be allowed to 

 dedicate this book to you. 



I remain, very respectfully. 



ISRAEL C. RUSSELL. 



