As Mollie's father repeated the legend, the children bent over the lake. Perhaps they could see the roofs of palaces, or the tops of towers, still standing on the bottom of the water. They had heard of people who said they had seen them. But the children were disappointed. Perhaps when they went rowing in the afternoon, they might yet catch a glimpse of the hidden city. Who could tell? Mollie's father had more to tell of another man, whose name was also O'Donaghue. He pointed to a little island not far from the shore. It was Ross Island, and an old, old castle, called Ross Castle, was still standing there. The stone walls were now in ruins. They were overgrown with moss and ivy. But hundreds and hundreds of years ago it was a great stronghold of Ireland's bravest warriors. The chief of them all was the daring O'Donaghue. Even now he cannot rest easy in his grave. Every seven years he rises up, and, mounting a white horse, rides around Ross Castle. And as he rides every stone goes back into its old place, and the castle is once more as strong and grand as in its best days. But this is only for the one night. When the sun shines the next morning, a heap of ruins is standing there, where the owls and bats may keep house in comfort. "How I should like to see the knight on his white horse!" said Norah. "Yes, but I should be afraid, I'm sure," said Mollie. "After all, the day is the best time to be outdoors, and my bed at home is the safest place after dark." When the lunch was eaten, the whole party crossed a bridge that spanned the water to Ross Island. The children played games over the smooth lawns, picked flowers, and told fairy stories. Then Mollie's brother rowed the girls out on the lake. Many a time he rested on his oars while the children called out and then listened for the echo to answer them. "There it is, hark!" said Tim. A party of travellers came rowing toward them. They had hired an Irish piper to go with them. As he played a slow tune, the answer came back. Tim whistled, and the echo repeated it. Then Norah sang the first line of "Come Back to Erin," and the echo sang it back again. But the afternoon was going fast, and the children could now hear Mollie's father calling to them from the shore. They must get back to land as soon as possible. When they reached the car, they jumped in, and all started at once for Muckross Abbey, at the other end of the lake. It had once been a great place of learning, but it was now in ruins. Ah! but such beautiful ruins, covered with mosses and creeping vines. How the ivy seemed to love the old stone walls! Some of Ireland's greatest men were buried here. Poets and soldiers and wise men lie in their tombs. Norah and Mollie stepped softly and spoke in low tones as they walked among them, half-buried in moss and ivy. But they did not linger long. They loved the sunshine and the brightness outside, and were glad to get back to them.