Early on the morning of the 3rd of July, the whole of our stores being removed, and Lieutenant Pritchard having received his orders, together with our despatches and letters for England, the _William Harris_ weighed with a light wind from the northward, and was towed out to sea by our boats. The day proving calm, we employed it in swinging the _Hecla_, in order to obtain the amount of the deviation of the magnetic needle, and to fix afresh the iron plate for correcting it. On the following morning, the wind being southerly, the pilots came on board, and the _Hecla_ weighed to run through the north passage; in doing which she grounded on a rock lying directly in the channel, and having only thirteen feet upon it at low water, which our sounding boats had missed, and of which the pilot was ignorant. The tide being that of ebb we were unable to heave the ship off immediately, and at low water she had sewed three feet forward. It was not till half-past one P.M., that she floated, when it became necessary to drop her down between the rock and the shore with hawsers; after which we made sail, and being soon after joined by the _Fury_, which came out by the other channel, we stood round the islands to the northwards. This rock was not the only one found by our boats which may prove dangerous to ships going in and out of this harbour, and with which our pilots were unacquainted. Another was discovered by Mr. Head, about one-third of the distance across from Kron Prins Island to the opposite shore of the S.E. entrance, and has not more than eighteen feet water on it at low tide; it lies very much in the way of ships coming in at that channel, which is the most commonly used. The latitude of the island, on which the observations were made, called by the Danes Boat Island, is 74° 28′ 15″; its longitude by our chronometers, 53° 12′ 56″; the dip of the magnetic needle, 82° 53′ 66″; and the variation, 70° 23′ 57″ westerly. The time of high water, at new moon, on the 26th of June, was a quarter-past eight, the highest tides being the third and fourth after the conjunction, and the perpendicular rise seven feet and a half.