The Nautical Surveyor (Mr. E. A. Cullen) has just finished a survey of the northern half of Moreton Bay, a work which was rendered necessary by the fact that the only chart available for use was one originally published by the Admiralty in 1865, with corrections inserted at various intervals up to within the last two years, since which great changes have taken place in the formation of the banks. Mr. Cullen accomplished the work in the "Pippo" in a most satisfactory manner, in the short space of five months, and a tracing of the new chart has been transmitted to the Admiralty for publication. The survey discloses changes of a prejudicial character at the entrance to the North or Howe Channel, which has been contracted by the extension of the east bank in a northerly direction about four cables, and the south-east extreme of the north bank to the eastward, about three and a half cables, while to the north-north-east of the north bank a small patch has formed, having only three fathoms upon it at low water. This patch is only one cable to the westward of the line of lights, and a continuance of similar growths will render the entrance at night exceedingly difficult, and probably destroy the utility of the present leading lights. The channel, however, at present maintains a depth in its shallowest part of 21 feet at low water, spring tides. The attached plan shows the position of the line of lights in relation to the three fathom patch and north-west extreme of the east bank. The three and five fathom contours as existing in 1886 are shown in red, while their present positions are indicated in black. Numerous other changes are shown on the new chart, but the banks to the westward, in the vicinity of the north-west channel, have changed so very little during the last twenty-five years that the channel may be regarded as practically a permanent one. It is the widest, deepest, and only permanent approach to Moreton Bay, and vessels of heavy draught, whose visits are rapidly increasing--including some of H.M. ships--have now to wait for daylight to enter the port by this channel. It is buoyed for use in the daytime, and can--when considered necessary--be easily and cheaply lighted for use at night. The approach to Moreton Bay by the South Passage should be discouraged, as the banks move about in a remarkable manner; and variation in the depth of water and direction of the channels being of frequent occurrence, it should be attempted only by men possessing good local knowledge, in vessels of light draught. WIDE BAY AND MARYBOROUGH.