single large hall in all the great fortress, and the courtyard within the main gate is a gloomy, ill-shaped little paved space, barely big enough to give fifty men standing room. Nothing can give any idea of the crookedness of it all, of the small dark corridors, the narrow winding steps, the dusky inclined ascents, paved with broad flagstones that echo the lightest tread, and that must have rung and roared like sea caves to the tramp of armed men. And so it was in the cities, too. In Rome, bits of the old strongholds survive still. There were more of them thirty years ago. Even the more modern palaces of the late Renascence are built in such a way that they must have afforded a safe refuge against everything except artillery. The strong iron-studded doors and the heavily grated windows of the ground floor would stand a siege from the street. The Palazzo Gabrielli, for two or three centuries the chief dwelling of the Orsini, is built in the midst of the city like a great fortification, with escarpments and buttresses and loop-holes; and at the main gate there is still a portcullis which sinks into the ground by a system of chains and balance weights and is kept in working order even now. In the Middle Age, each town palace had one or more towers, tall, square and solid, which were used as lookouts and as a refuge in case the rest of the palace should be taken by an enemy. The general principle of all mediæval towers was that they were entered through a small window at a great height above the ground, by means of a jointed wooden ladder. Once inside, the people drew the ladder up after them and took it in with them, in separate pieces. When that was done, they were comparatively safe, before the age of gunpowder. There were no windows to break, it was impossible to get in, and the besieged party could easily keep anyone from scaling the tower, by pouring boiling oil or melted lead from above, or with stones and missiles, so that as long as provisions and water held out, the besiegers could do nothing. As for water, the great rainwater cistern was always in the foundations of the tower itself, immediately under the prison, which got neither light nor air excepting from a hole in the floor above. Walls from fifteen to twenty feet thick could not be battered down with any engines then in existence. Altogether, the tower was a safe place in times of danger. It is said that at one time there were over four hundred of these in Rome, belonging to the nobles, great and small.