Note 4 — Chapter VI · The Winter Night (continued 3)

Markham’s account gives us to understand that on the north side of Grinnell Land he came across hummocks which measured 43 feet. I do not feel at all certain that these were not in reality icebergs; but it is no doubt possible that such hummocks might be formed by violent pressure against land or something resembling it. After our experience, however, I cannot believe in the possibility of their occurring in open sea.