Xerxes, on hearing this proposal, was greatly enraged. "How dare you," said he, "come to me with such a demand? You and all that pertain to you are my slaves, and are bound to do my bidding without a murmur. You deserve the severest punishment for such an insolent request. In consideration, however, of your past good behavior, I will not inflict upon you what you deserve. I will only kill one of your sons--the one that you seem to cling to so fondly. I will spare the rest." So saying, the enraged king ordered the son whom Pythius had endeavored to retain to be slain before his eyes, and then directed that the dead body should be split in two, and the two halves thrown, the one on the right side of the road and the other on the left, that his army, as he said, might "march between them." On leaving Phrygia, the army moved on toward the west. Their immediate destination as has already been said, was Sardis, where they were to remain until the ensuing spring. The historian mentions a number of objects of interest which attracted the attention of Xerxes and his officers on this march, which mark the geographical peculiarities of the country, or illustrate, in some degree, the ideas and manners of the times. There was one town, for example, situated, not like Celaenae, where a river had its origin, but where one disappeared. The stream was a branch of the Meander. It came down from the mountains like any other mountain torrent, and then, at the town in question, it plunged suddenly down into a gulf or chasm and disappeared. It rose again at a considerable distance below, and thence flowed on, without any further evasions, to the Meander. On the confines between Phrygia and Lydia the army came to a place where the road divided. One branch turned toward the north, and led to Lydia; the other inclined to the south, and conducted to Caria. Here, too, on the frontier, was a monument which had been erected by Croesus, the great king of Lydia, who lived in Cyrus's day, to mark the eastern boundaries of his kingdom. The Persians were, of course, much interested in looking upon this ancient landmark, which designated not only the eastern limit of Croesus's empire, but also what was, in ancient times, the western limit of their own. There was a certain species of tree which grew in these countries called the plane-tree. Xerxes found one of these trees so large and beautiful that it attracted his special admiration. He took possession of it in his own name, and adorned it with golden chains, and set a guard over it. This idolization of a tree was a striking instance of the childish caprice and folly by which the actions of the ancient despots were so often governed.