"Imp. Tiberius Cæsar Augustus," he read the legend, and then, looking at the reverse of the coin, he stared in amazement, and at last turned to Dyson with a look of exultation.
"Do you know what you have found?" he said.
"Apparently a gold coin of some antiquity," said Dyson, coolly.
"Quite so, a gold Tiberius. No, that is wrong. You have found the gold Tiberius. Look at the reverse."
Dyson looked and saw the coin was stamped with the figure of a faun standing amidst reeds and flowing water. The features, minute as they were, stood out in delicate outline; it was a face lovely and yet terrible, and Dyson thought of the well-known passage of the lad's playmate, gradually growing with his growth and increasing with his stature, till the air was filled with the rank fume of the goat.
"Yes," he said, "it is a curious coin. Do you know it?"
"I know about it. It is one of the comparatively few historical objects in existence; it is all storied like those jewels we have read of. A whole cycle of legend has gathered round the thing; the tale goes that it formed part of an issue struck by Tiberius to commemorate an infamous excess. You see the legend on the reverse: 'Victoria.' It is said that by an extraordinary accident the whole issue was thrown into the melting pot, and that only this one coin escaped. It glints through history and legend, appearing and disappearing, with intervals of a hundred years in time and continents in place. It was discovered by an Italian humanist, and lost and rediscovered. It has not been heard of since 1727, when Sir Joshua Byrde, a Turkey merchant, brought it home from Aleppo, and vanished with it a month after he had shown it to the virtuosi, no man knew or knows where. And here it is!"
"Put it into your pocket, Dyson," he said, after a pause. "I would not let any one have a glimpse of the thing, if I were you. I would not talk about it. Did either of the men you saw see you?"
"Well, I think not. I don't think the first man, the man who was vomited out of the dark passage, saw anything at all; and I am sure that the second could not have seen me."
"And you didn't really see them. You couldn't recognize either the one or the other if you met him in the street to-morrow?"