12 THE WORLD OF THE SEA. 
These icebergs must have been launched in the Arctic regions, 
and brought down by the currents which are flowing towards the 
equator. At 50° latitude, the shores are frequently covered 
THE APPEARANCE OF ICE AT THE POLE, 
with ice. Ten degrees further north the gulfs and inland seas 
begin to be frozen all over their surfaces. At 70° pieces of floating 
ice become numerous and large, frequently forming islands a mile 
and a half in diameter, and, at last, 10° higher, the sea is ice- 
bound, the ice-bergs piled one upon the other, fixed and motionless. 
These mountains of ice are tinted with vivid colours. They seem 
