passengers look down from the mountain tops on the forest-clad valleys far below; they speed along vast embankments or dash through passages cut in the solid rock, whose sides tower above them to the height of an ordinary steeple. In some places long tunnels were bored, so that the trains now enter a hill at one side and emerge from the other. One of these tunnels was thought to be unsafe; the immense mass of rock above it seemed likely to crush downwards upon the passage, and the engineers thought that their best course would be to remove the hill from above it. Three and a half tons of gunpowder were placed at intervals in the tunnel, and connected by wires with a galvanic battery placed a long distance off. The operation of firing the mine was made a public occasion, and Lady Belmore agreed to go up to the mountains and perform the ceremony of removing the hill. When all was ready, she touched the knob which brought the two ends of the wire together. A dull and rumbling sound was heard, the solid rock heaved slowly upward, and then settled back to its place, broken in a thousand pieces, and covered with rolling clouds of dust and smoke. All that the workmen had then to do was to carry away the immense pile of stone, and the course was clear for laying the rails. When the line reached the other side of the Blue Mountains there were great difficulties in the descent, and here the engineers had to lay out zigzags of greater extent than the former. By these the trains now descend easily and safely from the tops of the mountains down into the Lithgow Valley far below. [Illustration: THE TOWN HALL, SYDNEY.] By the southern railway to Albury, crowds of people are daily whirled in a few hours to places which, forty years ago, were reached by Sturt, and Hume, and Mitchell, only after weeks of patient toil, through unknown lands that were far removed from civilisation.