SMITHSONIAN CONTRIBUTIONS TO KNOWLEDGE— SHERZER. 



PLATE XVIII. 



Fig. I.— Glacial table, Victoria Glacier, looking southwest. Observe undercutting action of 

 rays upon south side and shadow cast by the rock upon north side, with 

 resultant ridge of ice. 



I'li;. 



-Dethroned glacial table, Vicloua Glacier, looking northeast. 

 to the south by undercutting action of sun's rays. 



boulder fallen 



