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In a Letter which was publish’d some Years ago in thePhilosophical Transactions , (No 418.) I made Mention of a strangePhœnomenon relating to the Sea-Compass, which I had frequently observed, when we were among the Ice inHudson's-Bay ; to wit, that the magnetic Virtue of the Needle was so far lost or destroyed, that it would not traverse as usual, even when the Ship was in a considerable Motion: And in my Voyage thither last Year, I observed our Compass would not move at all, any longer than the Quarter-Master kept touching it.

III. An observation of the magnetic needle being so affected by great cold, that it would not traverse; by Capt. Christopher Middleton, F. R. S