I have shown that the surface of the lands adjoining the Ancobra is a series of hummocks, rises, and falls, sometimes, though rarely, reaching 200 feet; that water abounds, and that it is to be had gratis. In every bottom there is a drain, sometimes perennial, but more often a blind gully or creek, [Footnote: The gully feeds a 'creek,' the creek a river.] which runs only during the Rains, and in the Dries carries at most a succession of pools. Here Norton's Abyssinian tubes, sunk in the bed after it has been carefully worked by the steam-navvy for the rich alluvium underlying the surface, would act like pumps, and dams would form huge tanks. Nor would there be any difficulty in making reservoirs upon the ridge-tops, with launders, or gutters, to collect the rain. Thus work would continue throughout the year, and not be confined, as at present, to the dry season. A pressure of 100 to 200 lbs. per square foot can easily be obtained, and the force of the jet is so great that it will kill a man on the spot. The hose should be of heavy duck, double if necessary, rivetted and strengthened by metal bands or rings--in fact, the crinoline-hose of Australia. Leather would be better, but hard to repair in case of accidents by rats; guttapercha would be expensive, and perhaps thin metal tubes with flexible joints may serve best. The largest hose carried by iron-clads measures 19 to 20 inches in diameter, and is worked by 30 to 40 horse-power. Other vessels have a 15-inch hose worked by manual labour, fifty men changed every ten minutes, and will throw the jet over the royal yards of a first-class man-of-war. The floating power-engines attached to the Dockyard reserves would represent the articles required. With a diameter of from ten to fifteen inches, and a nozzle of three to four inches, a 'crinoline-hose' will throw a stream a hundred feet high when worked by the simplest steam-power process, and tear down a hill more rapidly than a thousand men with shovels. The cost of washing gravel, sand, and clay did not exceed in our colonies 1_d._ to 2_d._ per ton; and thus the working expenses were so small that 4_d._ worth of gold to the ton of soft stuff paid a fair profit. Lastly, there is little danger to the miner; and this is an important consideration.