Sir Edward Pellew's Group, as will be seen by a reference to the plan, affords numerous anchorages against both the south-east and north-west monsoon; but unless it should be within the two small isles near the south-west side of Vanderlin's Island, where the depth was not well ascertained, there is not a single harbour, the different bays and coves being too shallow to admit a ship. Wood for fuel is easy to be procured; and water may be had in December, and probably as late as April or May, but I think not afterwards. The most accessible watering place we could find, was at the back of the mangroves near our principal anchorage, within the east point of North Island, where, with some trouble, our casks were filled; and at a beach there, left dry at low water, the seine was hauled with some success. At Vanderlin's Island there are many beaches fit for the seine; and indeed it seemed superior to the other islands as well for this, as for every other purpose, when a ship can lie there; it is also the most frequented by the Indians, and may probably have fixed inhabitants. The _latitude_ of Observation Island, from two meridian altitudes to the north and south, is 15° 36' 46" S. _Longitude_ from six sets of distances of the sun east of the moon, given in Table IV. of Appendix No. 1, 137° 6' 42"; but by the time keeper No. 543 corrected, it is preferably 137° 3' 15" E. The rates of the time keepers were found from afternoon's altitudes in an artificial horizon, between the 16th and 26th; and the means, with their errors from mean Greenwich time, at noon there on the last day of observation, were as under: Earnshaw's No. 543, slow 2h 29' 11.17" and losing 14.93" per day Earnshaw's No. 520, slow 4h 11' 37.59" and losing 28.25" per day This rate of No. 543 is only 0.19" more than that found at Sweers' Island, and so far as the six sets of lunars may be relied on, the longitude by this time keeper was not far from the truth; the letting down on the passage therefore did not seem to have produced any change; but in No. 520, the rate is more than 8" greater, and the longitude was getting 1½' per day too much to the east, as well before as after it was let down. The coast from Sweers' to Observation Island is consequently laid down by No. 543, with the small accelerating correction arising from the 0.19" increase of rate in 16.4 days. _Variation_ of the theodolite, observed on the east side of South-west Island, 2° 22' east. In the bearings taken at different parts within the group, the variation seemed to differ from 2° 30' to l° 30'. The largest variations were on the east sides of the islands, and the smallest on the west sides; seeming to show an attraction of the land upon the south end of the needle. On board the ship, when coasting along the east side of Vanderlin's Island, and the whole group lay to the west, the variation appeared from the bearings to be as much as 4° east.