April { A. M. } Observatory, { 15° 57ʹ 48-1/2ʺ } 15° 49ʹ 25ʺ east. 4th { P. M. } Mean of 4 needles { 15 41 2 } 5th. { A. M. } On board the ship,{ 19 50 49 } 19 44 57-1/2 17th. { P. M. } Mean of 4 needles { 19 38 46 } The variation found on board the ship ought to be taken for the true one, not only as it agreed with what we observed at sea; but because it was found that there was something ashore that had a considerable effect upon the compasses; in some places more than others. At one spot, on the west point of the sound, the needle was attracted 11-3/4 points from its proper direction. _Inclination of the dipping Needle._ April 5th. On board with { Marked } End North { 71° 26ʹ 22-1/2ʺ } 71° 40ʹ 22-1/2ʺ balanced needle { Unmarked } and dipping { 71 54 22-1/2 } The same needle { Marked } End North { 72 3 45 } 70 0 0 at the observatory { Unmarked } and dipping { 71 56 15 } 18th. Ditto { Marked } End North { 71 58 20 } 72 7 15 { Unmarked } and dipping { 72 16 10 } 5th. Spare needle at { Marked } End North { 72 32 30 } 72 49 15 the observatory { Unmarked } and dipping { 73 6 0 } 18th. Ditto { Marked } End North { 72 55 0 } 73 11 45 { Unmarked } and dipping { 73 28 30 } 22d. Spare needle on { Marked } End North { 73 28 38 } 73 11 0 board { Unmarked } and dipping { 72 53 30 } Hence the mean dip, with both needles, on shore, was 72 32 3-3/4 On board 72 25 41-1/4 This is as near as can be expected; and shows that whatever it was that affected the compasses, whether on board or ashore, it had no effect upon the dipping needles. _Tides._ It is high-water on the days of the new and full moon at 12^h 20^m. The perpendicular rise and fall eight feet nine inches; which is to be understood of the day tides, and those which happen two or three days after the new and full moon. The night tides, at this time, rise near two feet higher. This was very conspicuous during the spring-tide of the full moon, which happened soon after our arrival; and it was obvious that it would be the same in those of the new moon, though we did not remain here long enough to see the whole of its effect.