244 FRIDTJOF NANSEN. M.-N. Kl. 



niaxiiinim dcvelopiiunl of llic ice-caf)s llic- sca-levcl prohahly was con- 

 siderably lower lliaii now. 



Hence we may well assume that the ice-caps readied down to these 

 depths. The dc-])1hs may then indicate a kind of hase level to which the 

 underhin«^- .ground was eroded l>y the f.,daciers. It was j^reviously Cp. 23; 

 mentioned that the erosive power of a g'lacier, moving at a certain rate, 

 remains the same below water as above it, as long as it rests on the ground 

 anfl does not float. 



