The Skerryvore Lighthouse was at length successfully completed. The height of the tower is 138 feet 6 inches, of which the first 26 feet is solid. It contains a mass of stone work of more than double the quantity of the Bell Rock, and nearly five times that of the Eddystone. The entire cost, including steam tug and the building of a small harbour at Hynish for the reception of the little vessel that now attends the lighthouse, was L86,977. The light is revolving, and reaches its brightest state once every minute. It is produced by the revolution of eight great annular lenses around a central light, with four wicks, and can be seen from the deck of a vessel at the distance of 18 miles. Mr. Alan Stevenson sums up his deeply interesting narrative in the following words: "In such a situation as the Skerryvore, innumerable delays and disappointments were to be expected by those engaged in the work; and the entire loss of the fruit of the first season's labour in the course of a few hours, was a good lesson in the school of patience, and of trust in something better than an arm of flesh. During our progress, also, cranes and other materials were swept away by the waves; vessels were driven by sudden gales to seek shelter at a distance from the rocky shores of Mull and Tyree; and the workmen were left on the rock desponding and idle, and destitute of many of the comforts with which a more roomy and sheltered dwelling, in the neighbourhood of friends, is generally connected. Daily risks were run in landing on the rock in a heavy surf, in blasting the splintery gneiss, or by the falling of heavy bodies from the tower on a narrow space below, to which so many persons were necessarily confined. Yet had we not any loss of either life or limb; and although our labours were prolonged from dawn to night, and our provisions were chiefly salt, the health of the people, with the exception of a few slight cases of dysentery, was generally good throughout the six successive summers of our sojourn on the rock. The close of the work was welcomed with thankfulness by all engaged in it; and our remarkable preservation was viewed, even by many of the most thoughtless, as, in a peculiar manner, the gracious work of Him by whom the very hairs of our heads are all numbered!" Steam Navigation. I.--JAMES SYMINGTON. II.--ROBERT FULTON. III.--HENRY BELL. IV.--OCEAN STEAMERS. Steam Navigation. I.--JAMES SYMINGTON. Of the many triumphs of enterprise achieved by the agency of that tremendous power which James Watt tamed and put in harness for his race, perhaps the greatest and most momentous is that which has reversed the old proverb, that "time and tide wait for no man," given ten-fold meaning to the truth that "seas but join the regions they divide," and enabled our ships to dash across the trackless deep in spite of opposing elements,-- "Against wind, against tide, Steadying with upright keel,"