Part 39

Latitude 19 degrees 12 minutes south at noon.

25th October.

By noon observations we were only in latitude 18 degrees 42 minutes; longitude 113 degrees 32 minutes.

26th October.

The wind veering slightly to the south, we were able to make by noon to latitude 18 degrees 46 minutes 30 seconds; longitude 111 degrees 47 minutes 30 seconds.

27th October.

From this time to the 3rd November the winds continued to blow almost uninterruptedly from the south and eastward, which carried us as far west as longitude 101 degrees east, and latitude 31 degrees south, where we met with westerly winds, which enabled us to run up to within sight of Cape Naturaliste by the 8th.

9th November.

By 10 a.m. we were off Rottnest Island, when the pilot came on board and took us to the anchorage in Gage's Roads by noon. Having given instructions to Mr. Turner for the landing of the horses, etc., I landed with Messrs. Brown, Harding, and Hall, all of whom were, at their desire, at once released from the duties of the Expedition. Proceeded by steamer to Perth.

10th November.

Had an interview with His Excellency the Governor, and reported the safe return of the party and general results of the Expedition.

F.T. GREGORY,

Commander North-West Australian Expedition.

Perth, 6th February, 1862.

...

APPENDIX.

Adopting the course which I have found most convenient on similar occasions, I now proceed to offer a few remarks on the general features, productions, and natural capabilities, etc., of the country traversed by the Expedition, which could not, without disadvantage, have been introduced into the foregoing narrative. These remarks have already appeared at the conclusion of my report published on the 18th November, 1861, but are equally applicable to the present publication.

Commencing with its geographical and geological peculiarities, that portion of the country that came under our observation consists of a succession of terraces, rising inland for nearly 200 miles, more or less broken up by volcanic hills towards the coast. The first belt averages from ten to forty miles in width from the sea, and is a nearly level plain, slightly ascending to the southward, with an elevation of from 40 to 100 feet, the soil being generally either light loam or strong clays, according as it is the result of the disintegration of the granite rocks that occasionally protrude above its surface, or of volcanic rocks of black scoria that frequently interrupt the general level; hills of this nature also constitute the greater portion of the more elevated islands off the coast, Cape Lambert, and the promontory that shelters the western side of Nickol Bay. The generality of these rocks do not, however, yield so rich a soil as might be expected from their origin. This is owing to the absence of actual lava, the eruptive heat having nearly been sufficient to convert the superincumbent primary and tertiary rocks into a vitreous scoria, having a specific gravity of 3.2, and is highly indestructible in its texture.

Proceeding inland for the next fifty or sixty miles is a granite country that has been originally capped with horizontal sandstones, and has an elevation of about 1000 feet. This range terminates to the southward in level plains of good soil, the produce of the next series of more elevated country, while towards the northern edges the granite and sandstones have undergone great changes through the action of numerous trap dykes, that have greatly disturbed its surface, producing metamorphic rocks, some resembling jasper, and others highly cellular and scoriaceous.

In about latitude 22 degrees, on the meridian of Nickol Bay, we came upon another and more elevated range trending away to the south-east, having an altitude of 2500 feet above the sea. This, unlike the last section, has a southern escarpment of 500 or 600 feet, and consists of horizontal sandstones and conglomerates, which have comparatively undergone little change, and has an average breadth of eight or ten miles, the southern flank being bordered by fertile valleys of strong loamy clays, merging gradually to the southward into stony ridges and hills, some having an elevation of nearly 4000 feet, the culminating point being attained at Mount Bruce, in latitude 22 degrees 30 minutes.

From this point the country gradually falls to the Ashburton, the bed of which river, in the same meridian as the bay, is about 1600 feet above the sea, and the adjoining ranges not above 2200 feet, or about the same as the country on the Gascoyne, Lyons, and Upper Murchison.

Of minerals I was unable to discover any traces, except iron. Quartz reefs occasionally traversed the country in a north-north-east and south-south-west direction, or nearly the same as the mineral lodes at Champion Bay; but I could not find any instance in which this rock offered much to indicate the probable existence of gold, it being far surpassed in this respect by the rocks on the Upper Murchison. Coal does not appear likely to be found within the limits of the country passed over, unless towards the easternmost point attained by the Expedition.

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:--