THE ARCTIC REGIONS. 377 



route the materials \\liich they have transported 

 from the arctic continents, or from the beds of the 

 polar seas. 



If the sailor succeed in passing the zone where 

 these immense masses of ice float, lie may exi)ect 



Fig. 66. — Floating Glaciei-s. 



every instant to see the sea freeze up around his 

 vessel and keep him prisoner for entire months, in a 

 region where he may perish of hunger, should he 

 escape the thousaud-and-one more immediate dangei-s 

 which threaten him. 



