With respect to the harbours on the coast, I can only speak of Nickol Bay and the anchorage under Rosemary and the adjacent islands. The former I consider only second to King George's Sound, as it can be entered in all weathers, either from the north or north-east, and there is reason to believe that a safe passage exists between Legendre and Dolphin Islands, leading into Mermaid Straits, where there appears to be an excellent harbour at all seasons of the year.
The soundings towards the eastern and western shores of Nickol Bay, taken at low water, show sufficient depth for vessels of considerable tonnage to lie within a cable's length of the shore, the bottom being fine sand and soft mud. Towards the head of the bay the water is much shallower, not carrying more than two fathoms two miles from the shore. No reefs are known to exist in this bay, except quite close into land.
In making the running survey of the western promontory I found that all to the north of Sloping Head was an island, having a boat channel between from half a mile to a mile wide. To the outer portion I therefore gave the name of Dolphin Island.
The tides are tolerably regular, and average sixteen feet, but at the spring they rise twenty-one feet, on which occasions the whole of the western promontory, including the high lands for several miles to the westward, are entirely cut off by the sea, the other opening being under Enderby Island--a circumstance that greatly detracts from the value of these otherwise fine harbours, as it would require two miles of causeway to connect the best landing place, where water is to be found, with the mainland.
The average declination of the needle throughout this district I found to be 1 degree east, the result of many amplitudes and azimuths; there is, however, in the vicinity of many of the volcanic hills great local attraction.
Of the climate I can only say that during the five months we remained on the coast we never experienced the same inconvenience from it that we frequently have done within the limits of the settled districts of the colony; the weather was, however, principally fine, and the sky clear during our stay, only two showers having occurred--one at the latter end of May and the other in June. The meteorological register kept at Nickol Bay shows the following results, from observations taken at all hours of the day and night:--
Thermometer Max. Min
May 80 65
June 76 63
July 78 56
August 80 54
September 83 65
October 92 70
Under the peculiar circumstance of the thermometer being placed on a sandbank in the sun during the hot days in October, it rose to 178 degrees of Fahrenheit, whilst the lowest it ever fell to was up in the hills, in July, when it was 2 degrees below freezing just before sunrise.
The winds continued to blow almost uninterruptedly from the east and south-east during the first four months, veering to the south-south-east and south and occasionally to the north-east. Latterly the wind was alternately south-east in the morning, and north-west or westerly in the afternoon; the sky becoming frequently overcast, and every appearance of the near approach of the rainy season, which it has been observed by navigators and explorers to do about the beginning of November, and continue to March.
Amongst the natural productions I would first briefly refer to the beds of the pearl oysters, as they are likely to become of immediate commercial importance, considerable numbers having been gathered by the crew of the Dolphin at their leisure time, the aggregate value of which, I am told, is between 500 and 600 pounds; besides pearls, one of which has been valued by competent persons at 25 pounds. The limits of the bed are as yet undefined, but there is good reason to believe, from the position of it, that with proper apparatus ships could soon be loaded with them.