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any limit to man's power of destruction. This Line-Wall is armed with guns of the largest calibre, some of which are mounted on the parapet above, but the greater part are in the casemates below, and therefore nearer the level of the sea, so that they can be fired but a few feet above the water, and thus strike ships in the most vital part.

      The latest pets of Gibraltar are a pair of twins – two guns, each of which weighs a hundred tons! These are guarded with great care from the too close inspection of strangers. No description can give a clear impression of their enormous size. In the early history of artillery, the Turks cast some of the largest pieces in the world. Those who have visited the East, may remember the huge cannon-balls of stone, that may still be seen lying under the walls of the Round Towers on the Bosphorus. But those were pebbles compared with shot that can only be lifted to the mouth of the guns by machinery. The bore of these monsters would delight the soul of the Grand Turk, for, (as a man could easily crawl into one of them,) if the barbarous punishment of the old days were still reserved for great offenders, a Pasha who had displeased the Sultan might easily be put in along with the cartridge, and be rammed down and fired off!

      The guns had recently been tried, and found to be perfect, though the explosion was not so terrible as had at first been feared. There had been some apprehension that a weapon which was to be so destructive to enemies, might not be an innocent toy to those who fired it; that it might split the ear-drums of the gunners themselves. Some years ago I was at Syra, in the Greek Archipelago, when the English ironclad Devastation was lying in port, which had four thirty-five-ton guns, (the monsters of that day,) and one of her officers said that they "never fired them except at sea, for that the discharge in the harbor would break every window in the town." But here the effect seems not to have been so great. One who was present at the firing of one of the hundred-ton guns, told me that all who stood round expected to be deafened by the concussion. Yet when it came, they turned and looked at each other with a mixture of surprise and disappointment. The sound was not in proportion to the size. Indeed our Consul tells me that some of the sixty-eight pounders are as ear-splitting as the hundred-ton guns. But an English gentleman whom I met at Naples gave me a different report of his experience. He had just come from Malta, where they have a hundred-ton gun mounted on the ramparts. One day, while at dinner in the hotel, they heard a crash, at which all started from their seats, and rushed to the windows to throw them open, lest a second discharge should leave not a pane of glass unbroken. But this came only as they left the harbor. When about three miles at sea, they saw the flash, which was followed by a boom such as they never heard before. It was the most awful thunder rolling over the deep in billows, like waves of the sea, filling the whole horizon with the vast, tremendous sound. It was as "the voice of God upon the waters."

      But, of course, with the hundred-ton guns, as with any other, the main question is, not how much noise they make, but what is their power of destruction. Here the experiment was entirely satisfactory. It proved that a hundred-ton gun would throw a ball weighing 2,000 pounds over eight miles!1 With such a range it would reach every part of the bay, and a brace of them, with the hundreds of heavy guns along the Line-Wall, might be relied upon to clear the bay of a hostile fleet, so that Gibraltar could hardly be approached by sea.

      But these are not the whole of its defences; they are only the beginning. There are batteries in the rear of the town, as well as in front, that can be fired over the tops of the houses, so that, if an enemy were to effect a landing he would have to fight his way at every step. As you climb the Rock, it fairly bristles with guns. You cannot turn to the right or the left without seeing these open-mouthed monsters, and looking into their murderous throats. Everywhere it is nothing but guns, guns, guns! There are guns over your head and under your feet —

      "Cannon to the right of you,

      Cannon to the left of you;"

      and what is still more, cannon pointed directly at you, till you almost feel as if they were aimed with a purpose, and as if they might suddenly open their mouths, and belch you forth, as the whale did Jonah, though not upon the land, but into the midst of the sea!

      But my story is not ended. It is a good rule in description to keep the best to the last. The unique feature of Gibraltar – that in which it surpasses all the other fortresses of Europe, or of the world – is the Rock Galleries, to which I will now lead the way. These were begun more than a hundred years ago, during the Great Siege, which lasted nearly four years, when the inhabitants had no rest day nor night. For, though the French and Spanish besiegers had not rifled guns, nor any of the improved artillery of modern times, yet even with their smooth-bore cannon and mortars they managed to reach every part of the Rock. Bombs and shells were always flying over the town, now bursting in the air, and now falling with terrible destruction. So high did these missiles reach, that even the Rock Gun, on the very pinnacle of Gibraltar, was twice dismounted. Thus pursued to the very eagle's nest of their citadel, and finding no rest above ground, the besieged felt that their only shelter must be in the bowels of the earth, and gangs of convicts were set to work to blast out these long galleries, which we are now to visit.

      As it is a two miles' walk through them, we may save our steps by riding as far as the entrance. It is an easy drive up to the Moorish Castle, built by the African invader who crossed the Straits in 711, and finding the south of Spain an easy conquest, resolved to establish himself in the country, and a few years later built this castle on a shoulder of the hill, where it has stood, frowning over land and sea for nearly twelve centuries.

      Here we present an order from the Military Secretary, and the officer in charge details a gunner to conduct us through the galleries. The gate is opened, and we plunge in at once, beginning on the lower level. The excavation is just like that of a railway tunnel, except that no arches are required, as it is for the whole distance hewn through the solid rock, which is self-supporting.

      But it is not a gloomy cavern that we are to explore, through which we can make our way only by the light of torches, for at every dozen yards there is a large port-hole, by which light is admitted from without, at all of which heavy guns are mounted on carriages, by which they can be swung round to any quarter.

      After we have passed through one tier, perhaps a mile in length, we mount to a second, which rises above the other like the upper deck of an enormous line-of-battle ship. Enormous indeed it must be, if we can imagine a double-decker a mile long!

      Following the galleries to the very end, we find them enlarged to an open space, called the Hall of St. George, in which Nelson was once fêted by the officers of the garrison. It must have been a proud moment when the defenders of the Great Fortress paid homage to the Conqueror of the sea. As they drank to the health of the hero of the Battle of the Nile, they could hardly have dreamed that a greater victory was yet to come; and still less, that it would be a victory followed by mourning, when all the flags in Gibraltar would be hung at half-mast, as the flagship of Nelson anchored in the bay, with only his body on board, one week after the battle of Trafalgar.

      As we tramped past these endless rows of cannon, it occurred to me that their simultaneous discharge must be very trying to the nerves of the artilleryman (if he has any nerves), as the concussion against the walls of rock is much greater than if they were fired in the open air, and I asked my guide if he did not dread it? He confessed that he did; but added, like the plucky soldier that he was: "We've got to stand up to it!"

      These galleries are all on the northern side of the Rock, which, as it is very precipitous, hardly needs such a defence. But it is the side which looks toward Spain, and is intended to command any advance against the fortress from the land. Keeping in mind the general shape of the Rock as that of a lion, this is the Lion's head, and as I looked up at it afterward from the Neutral Ground, I could but imagine these open port-holes, with the savage-looking guns peering out of them, to be the lion's teeth, and thought what terror would be thrown into a camp of besiegers if the monster should once open those ponderous jaws and shake the hills with his tremendous roar.

      It is not often that this roar is heard; but there is one day in the year when it culminates, when the British Lion roars the loudest. It is the Queen's birthday, when the Rock Gun, mounted on the highest point of the Rock, 1,400 feet in air, gives the signal; which is immediately caught up by the galleries below, one after the other; and the batteries along the sea answer

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: The exact figures of this Armstrong Gun are: Weight, 101.2 tons. Length, 32.65 feet. Length of bore, 30.25 feet. Diameter of bore, 17.72 inches. Length of charge of powder, 5 feet. Weight of charge, 450 pounds. Weight of shot, 2,000 pounds. Velocity at the muzzle, 1,548 feet per second. At such velocity, a ball of such weight would have a "smashing effect" of 33.230 "foot-tons," and would penetrate 24.9 inches of wrought iron. Range, when fired at the highest elevation, over 8 miles.