A French geologist while exploring the quarry discovered a corpse shrivelled to a mummy, the hat lying close to his head, a rosary in his hand. It was conjectured to be the body of a workman who had died more than half-a-century before, the dry air and the absence of insects explaining the preservation of the corpse. Two centuries ago four Franciscan monks resolved to construct a chapel in honour of their tutelar saint. In order to be able to retrace their steps, they took with them a large ball of twine, leaving one end secured to a spot where people were constantly passing. Their twine unwound, they at length reached a vast hall, probably not visited for many ages. Near the entrance one of them drew a sketch of the convent, and wrote beneath it the date of their discovery. When about to return, what was their horror to find that their twine had snapped. They must have searched for it in vain, for never more did they return. At last the prior, alarmed at their absence, sent parties to explore the excavations, but so vast were they even then, that seven days elapsed before the corpses of the hapless friars were found, their faces downwards, and their hands folded as if in prayer. During the siege of Maestricht by the French Republic, a party of the besiegers occupied the quarries. The Austrians who garrisoned Fort Pierre at the back of the mountain, formed a plan to drive them out, and tunnelling made their way towards their enemies. Although they marched silently along, their torches betrayed them, and the besiegers pouring in a volley of musketry killed a large number, made prisoners of some, and drove the rest into the depths of the cavern. On the banks of the Nile are several prodigious stone quarries, from which the cities of ancient Egypt were built. Perhaps the largest is that of Haggar Silsibis. Here passages, broad as streets, with walls fifty or sixty feet high, now stretching straight forward, now curved, extend from the east bank of the river into the heart of the mountain, where halls have been hollowed out large enough to contain the Roman Colosseum, the rough hewn irregular roof resting upon immense square or many-sided pillars, some of which are eighty to a hundred feet in circumference. Here numerous blocks, already completely separated from the rock, appear ready to be transported; the labours of the quarry-men having suddenly been arrested by the invasion of the Conqueror, who overthrew the priests of Isis.