They repeated the operation, and after the second glass there was not much left in the measure. The flabby host had retired to the gloomy vaults within, where he played cards with a crony by the light of a small smoking lamp with a cracked chimney.

"That was the very place, was it not?" asked the carpenter at last, in a low tone, and almost without moving his lips.

The mason said nothing, but shrugged his shoulders, in a sort of enigmatic assent. Both drank again, and after a long time the carpenter smiled faintly.

"He was looking for the 'lost water,'" he said, in a tone of contempt.

The faint smile slowly reflected itself in the mason's face. The two finished their wine, lit their pipes again, left the price of their drink on the table without disturbing the host and went away.

So far as any outsider could have judged, the expert's curiosity and the few words exchanged by the workmen referred to the so-called "lost water," which might be somewhere under the north-west corner of the Palazzo Conti, and no one unacquainted with subterranean Rome could possibly have understood what any of the three meant.

The "lost waters" of Rome are very mysterious. Here and there, under old streets and far down amongst the foundations of ancient palaces, there are channels of running water which have no apparent connection with any of the aqueducts now restored and in use. It is a water that comes no one knows whence and finds its way to the Tiber, no one knows how. It is generally clear and very cold, and in the days when the aqueducts were all broken and most people drank of the river, the "lost water" was highly prized. It appears in the most unexpected places, sometimes in great quantities and seriously interfering with any attempt to lay the foundations of a new building, sometimes black and silent, under a huge flagstone in an old courtyard, sometimes running with an audible rush through hidden passages deeper than the deepest cellars. It has puzzled archaeologists, hydraulic engineers and architects for generations, its presence has never been satisfactorily explained, there seems not to be any plan of the city which shows its whereabouts, and the modern improvements of the Tiber's banks do not appear to have affected its occult courses. By tradition handed down from father to son, certain workmen, chiefly masons and always genuine Romans, claim to know more about it than other people; but that is as much as can be said. It is known as the "lost water," and it rises and falls, and seeks different levels in unaccountable ways, as water will when it is confined under the earth but is here and there confronted by the pressure of the air.

But though the old-fashioned Roman workman still looks upon all traditional information about his trade as secret and never to be revealed, that fact alone might seem insufficient to account for the behaviour of Gigi the carpenter and of Toto the mason under the particular circumstances here narrated, still less for the contempt they showed for the snuffy expert who was apparently looking for the "lost water." An invisible witness would have gathered that they had something of more importance to conceal. To the expert, their conduct and answers must have been thoroughly unsatisfactory, for the Vatican was even said to have refused to pay the additional fifty thousand francs, On the ground that the state of the foundations was doubtful and that the timbers of the upper story were not sound.

Baron Volterra's equanimity was not in the least disturbed by this. On the contrary, instead of setting the price lower, he frankly told all applicants, through his agent, that he was in no hurry to sell, as he had reason to believe that the land about the Palazzo Conti would soon rise in value. He had settled with the representatives of the Conti family, and it was said that he had behaved generously. The family had nothing left after the crash, which might partially account for such an exhibition of generosity; but it was hinted that Baron Volterra had given them the option of buying back the palace and some other property upon which he had foreclosed, if they should be able to pay for it in ten years.

Soon after the visit of the snuffy expert, Volterra's agent informed the porter that a gentleman had taken the small apartment on the intermediate story, which had formerly been occupied by a chaplain but had been disused for years. It had been part of the Conti's folly that they had steadily refused to let any part of the vast building since the old Prince's death.