COLONIAL BUSINESS NEWS.The Australian Telegraph.—It is no full anticipated (says the Tasmanian Telegraph) that by the first day of 1872, Hobart Town will bewithin a few hours’ distance from London, telegraphically speaking. Assuming that the steamships which ave the Australia! submarine cab on board are able to submerge the wire from Palmerston (Port Darwin) to Timor, and thence to Java, by the end of the year, and that London and the North of Australia are then en rapport, we have a certainty that news from all the telegraphically-connected countries of the world will come to hand at short, if fitful, interval The progress made by the land parties in Central Austral , has been so great, that at the close of the year, if the wires have not been extended over all the sections between Port Augusita and Port Darwin, the gt is will be few and small, and easily bridged over for .he t ne. Mounted messengers will carry dispatches across these fas • closing intervals, and early in January the whole line will be completed. We have also the certainty of an alternate overland line, for the Queensland telegraph has now been completed to Georgetown, on the Etheridge River, and communication between Normantown, on the Gulf of Carpentaria, and Brisbane (and all the southern colonies, including Tasmania) will be opened by the first week n December. This line could very readily be extended to the sea cable at Port Darwin, the country between he gulf and the port being most favourable for such a purpose. These construction parties have taken away from the great centre of Australia all the mystery so long attached to it. There is no desert — no scorching plains unendurable by whites. The worst portion of the interior is that which is nearest to South Australia, and the best is that which is farthest north. It has been found well watered, well grassed, well timbered, picturesque in scenery, and gold-producing on the head waters of the Roper River. Settlement will speedily follow the formation of the telegraph stations.