The telegraph line divides Australia into two portions, nearly equal in dimensions, but very different in character. To the east are the busy and rapidly advancing settlements, fertile plains, extensive ranges of grassy downs, broad rivers, abundant vegetation; to the west a great lone land, a wilderness interspersed with salt marshes and lakes, barren hills, and spinifex deserts. It is the Sahara of the south, but a Sahara with few oases of fertility, beyond which is the thin fringe of scattered settlements of the colony of Western Australia. To cross this desert, to discover routes connecting the western territory with South Australia and the line marked by the telegraph, has been the ambition of later explorers. Mr. Gregory attempted, from the north, to ascend the Victoria River, but only reached the upper edge of the great desert. Dr. Leichardt, who had previously travelled from Moreton Bay, on the eastern coast, to Port Essington on the northern, attempted to cross from the eastern to the western shores, and has not since been heard of. Mr. Eyre made a journey, memorable for the misfortunes which attended it, and the sufferings he endured, from Adelaide round the head of the great bay, or Bight of Southern Australia, to Perth, the capital of Western Australia; and much more recently Colonel Egerton Warburton succeeded in crossing from the telegraphic line to the western coast across the northern part of the great wilderness, nearly touching the farthest point reached by Mr. Gregory. EYRE'S JOURNEY.