It is chiefly in the head waters or feeders of the greater streams which flow through this vast basin that the metal has hitherto been met with; but the peculiar physical character of the creeks, and of the climate in these regions, suggests the probability that the search will be profitably extended downwards along the entire course of the larger rivers. Every reader of Australian tours and travels is aware of the deep and sudden floods to which the great rivers of the country are subject, and of the disastrous inundations to which the banks of the river Murray are liable. The lesser creeks or feeders of this river, in which the washings are now prosecuted, are liable to similar visitations. The Summerhill creek, for example, at its junction with the Lewis river, is described as fifty or sixty yards wide, and the “water as sometimes rising suddenly twenty feet.” Now, supposing the gold drift to have been originally confined to the districts through which the upper waters of these rivers flow, the effect of such floods, repeated year by year, must have been to wash out from their banks and bottoms, and to diffuse along the lower parts of their channels, or of the valleys they flooded, the lighter portions, at least, of metallic riches in which the upper country abounded. The larger particles or lumps may have remained higher up: but all that the force of a deep stream in its sudden flood could carry down, may be expected among the sands and gravels, and in the wider river beds, and occasionally flooded tracts of the lower country. In other words, there is reason to believe that from its head waters on the western slopes of the Australian Alps, to its mouth at Adelaide, the Murray will be found to some degree productive in gold, and more or less remunerative to future diggers. But there is in reality no reason to believe that the gold of the great Australian basin was ever confined—at least since the region became covered with drift—to the immediate neighbourhood of the mountains, or to the valleys through which its mountain streams pursue their way. We have already fully explained that it is not to the action of existing rivers on the native gold-bearing rocks of the mountain, that the presence of the precious metal in their sands is generally due, but to that of numerous degrading causes, operating simultaneously and at a more ancient period, when the whole valley was covered deep with water. By these, the debris of the mountains here, as in California, must have been spread more or less uniformly over the entire western plain. This vast area, therefore, comprehending so many thousand square miles, may, through all its drifted sands and gravels, be impregnated with metallic particles. Dry diggings, consequently, may be hereafter opened at great distances from the banks of existing streams. Time alone, in fact, can tell over how much of this extensive region it will pay the adventurer to dig and wash the wide-spread depths of drift.