"Is the doctor here a good one?"

"Splendid! A Johns Hopkins man here for his health."

"What else can I do?" asked Uncle Denny. "Shall I come in and sit with him?"

"No; ask Mrs. Flynn to come over after dinner. You go out and see the dam and be proud of your boy."

"And of me girl," said Uncle Denny. He had been standing with his hat in his hand and now he bent and kissed Pen's cheek.

"Erin go bragh!" said Pen. "Uncle Denny, I'm tired! I feel as if I were running on one cylinder and three punctured tires. I have to talk that way after my close association with Bill Evans!"

Uncle Denny had a delightful trip over the Project with Murphy. He dined with the upper mess so that Mrs. Flynn could devote herself to Pen. After eating, he started down the great road to the tower foot to meet Murphy.

Before he came to the tower, however, he came on a group of men hovering over the canyon edge. Uncle Denny gave an exclamation of pity. A mule with a pack on its back had slipped off the road and hung far below by the rope halter that had caught around a projecting rock. The hombre who had been driving the mule had gone for ropes.

"See how still he keeps, the old cuss," said Jack Henderson gently. "A horse would have kicked himself to death long ago. That mule knows just what's holding him. A mule forgets more in a minute than a horse knows in a year."