Now come the inland arteries, the streams running through the tableland and feeding the Darling and the Murray. These are the Murrumbidgee, which equals the Murray almost in importance, the Lachlan and the Darling, which brings down the waters of a hundred streams, the Macquarie, the Castlereagh, and the Bogan, the Namoi and Gwydir, the Dumaresque, the Condamine, the Maranoa, the Moonie, and the Warrego. And falling into the Murray itself, from the south are, the Ovens, the Goulburn, the Mitta Mitta, the Campaspe and the Loddon.
The other rivers of' the inland slope are the Barcoo and Thomson, forming Cooper's Creek, the Diamentina, the Burke and the Hamilton, the Herbert or Georgina, and Eyre Creek, all these end in the flats and shallows of the Great Salt Lake District.
The remaining watercourses to the westward cannot be classed in any way, their course is apparently determined by local inequalities of the surface, and although some are very considerable in appearance, their flow is so brief that it is impossible to consider them as at all forming parts of one system; the longest and most important is Sturt's Creek.
The coast country, meaning the land watered by the rivers first enumerated, has the advantage over the tableland in the matter of rainfall, and the rivers therefore possess more of the characteristics of running streams, than the chains of isolated ponds that are known as rivers in the inland slope. The climatic influence is especially noticeable in the indigenous grasses and herbage of the two regions. Mr. George Ranken, in one of his essays on Australian subjects ["The Squatting System of Australia," by "Capricornus."] draws an excellent picture of the reclamation and transformation of the forest primeval.
"The first comers in 1788, found before them, as their ships came to anchor, sandstone bluffs covered with scraggy trees and heath-like plants, with a bright blue sky above, and an elastic, buoyant atmosphere around. As they went inland, they found an endless open forest, the ground being clothed with a light, tufty grass, but it was the starved outline of European woodland scenery, for the trees rose bare and branchless from a thirsty soil, and the grass covered only half, the surface of the earth. Except the grass, and that was thin enough, though it grew everywhere, the country seemed poor in products, and looked as if it were involved in a constant struggle between droughts and floods. They would have judged it to be poor in capability also, if, on further experience, a vitality had not appeared which seemed to electrify the soil on the touch of colonisation. Imported animals, trees, and plants lived and flourished among the dingy forests, which barely yielded food enough for a few wandering savages.
"The farther they went, the greater contrast appeared, more drought and better country; and in later times, as the last of enigmas, a change of vegetation and climate seemed to follow the settler with his flocks and herds. After a few years' feeding with stock, water has been found permanently standing in country where it never stood before, and sometimes the tufty herbage has changed into a sward. The flats that used in one season to show a succession of swamps, and in another a surface of bare dusty soil, rifted with yawning cracks, has often become good level turf, intersected with runnels cut by the hoofs of the sheep and cattle."
The first invasion of the new territory across the range led to a terrible feeling of disappointment; true, that on at once crossing the crest of the watershed country was found, which being partly within the influence of the heavier fall of rain, approached in every way the perfection dreamt of by the explorers; but as progress inland was made, a change was found to take place, and, above all, the familiar indigenous grasses were lost, and replaced by what the settlers took to be nothing but worthless weeds. All the now prized edible shrubs, such as the many kinds of saltbush, the cotton-bush, &c., were amongst these despised plants; and even the very stock did not take to them, until some years of use had rendered them familiar. These drought-resisting plants were at first supposed to be confined to the inner slope of the range, but the extended exploration of the continent shows us that where the coast range loses its character of a pronounced range, and is only represented by an insignificant rise, the characteristics of the plain are continued right down to within a short distance of the sea.
This is notably the case on the north, where the Flinders River and its tributaries drain country that bears all the distinctive growth of the interior. On the south coast, west of the Murray, this is also the case, and in these parts, through the depression of the range, the climate is much drier. On the eastern coast, however, the distinction between the uplands and lowlands is strongly marked both in Queensland and New South Wales, even in those cases where the rivers rise in uplands approaching in elevation to the level of the tableland. The eastern coast of northern Queensland is, from its situation and the superior height of the coast range combined, the tropical garden of Australia, the luxuriant growth of vegetation, taking the form of dense scrubs and jungles springing from a deep, rich soil. These scrubs, of slightly varying character, form a characteristic of the whole length of the eastern seaboard, and amongst them we find much valuable timber. The cedar tree is one important feature, and the kauri pine is found in one small tract in the north of Queensland.
Further south, however, the trees grow to an enormous height in the elevated forest lands. Victoria and Western Australia are particularly noted for the giant growth of some of their trees. In Victoria the white gum (EUCALYPTUS AMYGDALINA) has been found growing to a height of over four hundred feet; the red gum (EUCALYPTUS ROSTRATA), and the blue gum (EUCALYPTUS GLOBULUS) also attain a great size in our southern colonies. In Western Australia the jarrah (EUCALYPTUS MARGINATA) and the karri (EUCALYPTUS DIVERSICOLOR) have become noted in the world as being most valuable hardwoods.
Right through the continent, from east to west, the box tree (EUCALYPTUS MALLIODORA) is to be found. On the tableland the timber is altogether of a different growth. The giants of the slopes of the seaward range are replaced by low, stunted, and crooked trees, some of them, however, possessing edible foliage. Most of the acacias are of this kind—the ACACIA PENDULA or myall, the brigalow, the mulga, and yarran. The CAESARIANSAE common all over Australia, under the name of the oak tree.
The difference between the products of the interior upland and the coastal lowland is mainly induced by the difference of climate, those grasses and herbs growing on the tableland, while repellent in appearance and colour, compared to the richer herbage of the coast, possess qualities that render them invaluable as fodder plants. Once let the grasses of the coast lose their moisture from drought, and they become sapless and worthless, but it is not so in the tableland. Months of dry weather have no effect upon the fattening properties of the shrubs; the stock, however, have to become used to feeding on them before their full value is attained.
Amongst the fauna of Australia the distinction between coast and tableland is not so well marked, most of the well-known species ranging indifferently over the whole continent.