. SEA mix 42 60 f>9 71 '9 Fig. 16. Chart of Douglas Strait, Southern Thule, showing soundings in the submarine crater. entrances there is less than 20 fathoms. That the basin was once a volcanic crater scarcely admits of doubt. It is probable that by its eruption it originally formed one large island, and that of this island Cook and Thule are the only portions now remaining. 1 Rear-Admiral H. P. Douglas, , , member of the Discovery Committee.

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