have noticed as common to the sand-stone formation. A small but lively stream, called Paddy's River, runs at the bottom of this pass,

and immediately to the S.W. of it, an open forest country of granite base extends for many miles, on which the eucalyptus manifera is prevalent, and which affords the best grazing tracts in Argyle. At Goulburn Plains, however, a vein of limestone occurs, which is evidently connected with that forming the ShoalHaven Gully, which is perhaps the most remarkable geological feature in the colony of New South Wales. It is a deep chasm of about a quarter of a mile in breadth, and 1200 feet in depth. The country on either side is perfectly level, so much so that the traveller approaches almost to its very brink before he is aware of his being near so singular an abyss. A small rivulet flows through the Gully, and discharges itself into the sea at ShoalHaven; but this river is hardly perceptible, from the summit of the cliffs forming the sides of the Gully, which are of the boldest and most precipitous character. The ground on the summit is full of caves of great depth, but there has been a difficulty in examining them, in consequence of the violent wind that rushes up them, and extinguishes every torch.

The open and grassy forests of Argyle are ter

minated by another of those abrupt sand-stone passes I have just described, and the traveller again falls considerably from his former level, previously to his entering on Yass Plains, to which this pass is the only inlet.

From Yass Plains the view to the S. and S.W. is over a lofty and broken country: mountains with rounded summits, others with towering peaks, and others again of lengthened form but sharp spine, characterise the various rocks of which they are composed. The ranges decline rapidly from east to west, and while on the one hand the country has all the appearance of increasing height, on the other it sinks to a dead level; nor on the distant horizon to the N. W. is there a hill or an inequality to be seen.

From Yass Plains to the very commencement of the level interior, every range I crossed presented a new rock-formation; serpentine quartz in huge white masses, granite, chlorite, micaceous schist, sandstone, chalcedony, quartz, and red jasper, and conglomerate rocks.

It was however, out of my power, in so hurried a journey as that which I performed down the

banks of the Morumbidgee River, to examine with the accuracy I could have wished, either the immediate connection between these rocks or their gradual change from the one to the other. I was content to ascertain their actual succession, and to note the general outlines of the ranges; but the defect of vision under which I labour, prevents me from laying them before the public.

From what has been advanced, however, it will appear that the physical structure of the southern parts of the colony is as varied, as that of the western interior is monotonous, and we may now pursue our original observations on the soil of the colony with greater confidence.

In endeavouring to account for the poverty of the soil in New South Wales, and in attributing it in a great degree to the causes already mentioned, it appears necessary to estimate more specifically the influence which the geological formation of a country exercises on its soil, and how much the quality of the latter partakes of the character of the rock on which it reposes. And although I find it extremely

difficult to explain myself as I should wish to do, in the critical discussion on which I have thus entered, yet as it is material to the elucidation of an important subject in the body of the work, I feel it incumbent on me to proceed to the best of my ability.

I have said that the soil of a country depends much upon its geological formation. This appears to be particularly the case in those parts of the colony with which I am acquainted, or those lying between the parallels of 30° and 35° south. Sandstone, porphyry, and granite, succeed each other from the coast to a very considerable distance into the interior, on a N. W. line. The light ferruginous dust that is distributed over the county of Cumberland, and which annoys the traveller by its extreme minuteness, to the eastward of the Blue Mountains, is as different from the coarse gravelly soil on the secondary ranges to the westward of them, as the barren scrubs and thickly-wooded tracts of the former district are to the grassy and open forests of the latter.

As soon as I began to descend to the westward it became necessary to pay strict and

earnest attention to the features of the country through which I passed, in order to determine more accurately the different appearances which, as I was led to expect, the rivers would assume. In the course of my examination I found, first, that the broken country through which I travelled, was generally covered with a loose, coarse, and sandy soil; and, secondly, that the ranges were wholly deficient in that peat formation which fills the valleys, or covers the flat summits of the hills or mountains, in the northern hemisphere. The peculiar property of this formation is to retain water like a sponge; and to this property the regular and constant flow of the rivers descending from such hills, may, in a great measure, be attributed. In New South Wales on the contrary, the rains that fall upon the mountains drain rapidly through a coarse and superficial soil, and pour down their sides without a moment's interruption. The consequence is that on such occasions the rivers are subject to great and sudden rises, whereas they have scarcely water enough to support a current in ordinary seasons. At one time the traveller will find it impracticable to cross them: at another he may do so with ease; and

only from the remains of debris in the branches of the trees high above, can he judge of the furious torrent they must occasionally contain.

This seeming deviation on the part of Nature from her usual laws will no longer appear such, if we consider its results for a moment. The very floods which swell the rivers to overflowing, are followed by the most beneficent effects; and, rude and violent as the means are by which she accomplishes her purpose, they form, no doubt, a part of that process by which she preserves the balance of good and evil. Vast quantities of the best soil have been thus washed down from the mountains to accumulate in more accessible places. From frequent depositions, a great extent of country along the banks of every river and creek has risen high above the influence of the floods, and constitutes the richest tracts in the colony. The alluvial flats of the Nepean, the Hawkesbury, and the Hunter, are striking instances of the truth of these observations; to which the plains of O'Connell and Bathurst must be added. The only good soil upon the two latter, is in the immediate neighbourhood of the Macquarie River: but, even close to its banks,

the depositions are of little depth, lying on a coarse gravelly soil, the decomposition of the nearer ranges. The former is found to diminish in thickness, according to the concavity of the valley through which the Macquarie flows, and at length becomes mixed with the coarser soil. This deposit is alone fit for agricultural purposes; but it does not necessarily follow that the distant country is unavailable since it is admitted, that the best grazing tracts are upon the secondary ranges of granite and porphyry. These ranges generally have the appearance of open forest, and are covered with several kinds of grasses, among which the long oat-grass is the most abundant.

If we except the valley of the Nepean, the banks of the South Creek, the Pennant Hills near Parramatta, and a few other places, the general soil of the county of