One day as the master and man were wandering amongst old monuments, reading with much pleasure the inscriptions, Xantus came to one which he could not understand, although he remained a considerable time trying to explain it. It was composed of the first letters of certain words, and the philosopher avowed that he could not solve the problem which it presented. "If I help you to find a treasure by means of those letters," said Æsop, "what will you give me?" Xantus promised him his liberty and half the treasure. "They mean, then," said Æsop, "that four paces from this column a treasure lies concealed." After having dug for some time they found that such was indeed the case. The philosopher was now called upon to keep his word; but he still declined to do so. "May the gods forbid I should set you free," said he to Æsop, "before you have explained the mystery of those letters. To know that will be a greater treasure to me than what we have found." "Well," said Æsop, "they have been engraved here as the first letters of these words, Απόβας Βήματα, &amp;c.; that is to say, <i>If you step back four paces</i> and then dig, you will find a treasure." "As you are so clever," said Xantus, "I should be wrong to part with you; so give up the idea that you will ever be free." "And I, for my part," said Æsop, "will denounce you to King Denys, for it is to him that the treasure belongs, and these letters are the initials of other words which state the fact." The philosopher, alarmed, told his slave to take his part of the treasure and to say nothing about it; on which Æsop declared that he was under no obligation to him, for that these letters had been selected in such a manner that they contained a triple sense, and signified still further, "As you go away, you will divide the treasure which you have discovered." When they had returned home, Xantus ordered that Æsop should be put in irons and imprisoned, for fear that he should make the adventure known. "Alas!" cried Æsop, "is it thus that these philosophers fulfil their promises? But do as you will, Master Xantus, you shall set me free at last in spite of yourself."