Further researches into the well being out of the question, their next step was to make a thorough inspection of the chapel-cave itself.  They examined the walls inch by inch, tapping them with a hammer to hear if they sounded hollow, but without result.  They examined the altar, but it proved to be a solid mass of rock.  By the help of a little ladder they had made, they examined the crucifix, and discovered that the white figure on the cross had evidently been fashioned out of some heathen statue of soft limestone, for at its back were the remains of draperies, and long hair which the artist had not thought it necessary to cut away.  Also, they found that the arms had been added, and were of a slightly different stone, and that the weight of the figure was taken partly by an iron staple which supported the body, and partly by strong copper wire twisted to resemble cord, and painted white, which was passed round the wrists and supported the arms.  This wire ran through loops of rock cut in the traverse of the cross, that itself was only raised in relief by chiselling away the solid stone behind.

Curiously enough, this part of the search was left to Mr. Clifford and Benita, since it was one that Jacob Meyer seemed reluctant to undertake.  A Jew by birth, and a man who openly professed his want of belief in that or any other religion, he yet seemed to fear this symbol of the Christian faith, speaking of it as horrible and unlucky; yes, he who, without qualm or remorse, had robbed and desecrated the dead that lay about its feet.  Well, the crucifix told them nothing; but as Mr. Clifford, lantern in hand, descended the ladder, which Benita held, Jacob Meyer, who was in front of the altar, called to them excitedly that he had found something.

“Then it is more than we have,” said Mr. Clifford, as he laid down the ladder and hurried to him.

Meyer was sounding the floor with a staff of wood—­an operation which he had only just began after the walls proved barren.

“Listen now,” he said, letting the heavy staff drop a few paces to the right of the altar, where it produced the hard, metallic clang that comes from solid stone when struck.  Then he moved to the front of the altar and dropped it again, but now the note was hollow and reverberant.  Again and again he repeated the experiment, till they had exactly mapped out where the solid rock ended and that which seemed to be hollow began—­a space of about eight feet square.

“We’ve got it,” he said triumphantly.  “That’s the entrance to the place where the gold is,” and the others were inclined to agree with him.