Plate I.— Icebergs often keep their sides 

 clifflike and perpendicular by repeated 

 calving. When undercut tini; along the 

 water line reaches a certain point the over- 

 hanging ice masses fall down into the sea, 

 leaving a rough surface like this. Taken 

 from a ship's boat Julv 15. 1929, in 

 latitude 41° .34' X., longitude 48° 58' W. 



