Plate XI\'.— Filing explosive 6-pounder shells into the high thin wall formin? one side of a dry-doc'.c 

 t vpe of berg. In this instance a number of tons of cracked ice were brought down into the sea. 

 .lulv 11, 1929. latitude 41° 34' N., longitude 49° 00' W. 



Plate XV.— Two olRcers from the Modoc on a large growler that an hour earlier formed a projecting 

 ledge just below the water line of a near-hy berg. This ice was entirely melted within 24 hours, 61- 

 degree water, July 24, 1929, latitude 42° 10' X., longitude 49° 30' \V. 



