120 S. CALVIN lOWAN DIJIKT 



of the lowan ice the altitude of the Mississippi valley was low, and tliat 

 the country extending outward from the lowan margin was flooded with 

 practically stagnant water. Admitting such a possibilit}', it follows that 

 the weight of the ice at its edge was partly supported by water, that the 

 friction between the ice and the ground was consequently reduced, and 

 that by reason of the diminished friction the motility of the ice was 

 greatly increased. This is offered, with many misgivings, merely as a 

 suggestion to account for the remarkable power of flowing out in long 

 tongues and meeting around prominent elev^ations that seems to have 

 characterized an unusually thin sheet of ice. 



