It is the tremendous and irresistible action of the surge which detaches them from the continents or islands of the high latitudes.

Then the currents carry them into less cold waters, where their edges are worn by the waves, while the temperature disintegrates their bases and their sides, which are subjected to thermometric influences." "That seems very plain," I replied.

"Then these masses have come from the icebergs.

(1) They clash with them in drifting, sometimes break into the main body, and clear their passage through.
Again, we must not judge the southern by the northern zone.

The conditions are not identical.