From the bearings, however, and from our run on the following morning we found it necessary to correct the chart, thus decreasing the number of islands. We found that marked 5, to have no existence, and 6, far too much to the westward, while 8 and 10 were placed to the eastward of their true position. These errors occasionally occur where they are numerous, much alike, and are passed quickly. The change in the number and position of the islands is in some measure hostile to the views of Captain King, and I am further inclined, from these corrections, to draw the conclusion that Number 4 of the group is Boydan island, a name given by the Murray islanders, to the spot rendered notorious by the cold-blooded massacre we have already alluded to, and which will be described more in detail in Captain Stanley's highly interesting narrative, further on in the present work. On examining the reef fronting the island, which is a more perfect specimen of a lagoon than any we had yet seen, we found that the outer edge consisted of a wall higher than any of the parts within, rising at low-water, to an elevation of ten feet, while inside, pools or holes existed, three or four feet deep, containing live coral, sponges, sea-eggs, and trepang. Scattered about on different parts of the reef were many Chama gigas, not, however, so large as those I had formerly seen at Keeling or Cocos Islands, in the Indian Ocean, weighing 220 pounds. Singular to say, at 3 P.M., I observed the latitude by a meridian altitude of Venus, although a bright sunny day. The result agreed with Captain King's chart, placing the centre of the island in latitude 11 degrees 28 minutes South. TIDAL OBSERVATIONS. We experienced more tide here than at any anchorage we had yet occupied during the passage. From 1 to 5 P.M., it set half an knot an hour to the southward, then changed to North-West by North, increasing its rate to one knot by 10 o'clock, and decreasing it to a quarter of a knot by 2 A.M., when it again set to the South-South-West. The stream thus appears to set nine hours North-West by North and three South-South-West. The short duration of the latter, which is the ebb, is caused by the northerly direction of the prevailing current. This also was the only spot where our fishermen had any success; in a few hours several dozen of a species of small red bream being caught.