“I do not see—” began Irene, when he interrupted brusquely.

“No,” he said; “nobody sees. The solution of the riddle is probably so simple that nobody will think of it. It will be hit upon by accident some day. But, for the sake of goodness, let us talk of something else. I always lose my temper when the McHugh diamonds are mentioned.”

He relieved his impatience by a fierce spurt at the oars, which sent the boat spinning through the water; then he shook himself as if to shake off unpleasant thoughts, and once more allowed the current to take them along. Irene looked at him with wistful eyes. She would have been so glad to give him all her money if he would have it.

“You told me,” she said at length, with a faint air of self-consciousness, “that you wanted to say something to me.”

The young lieutenant flushed, and looked between the trunks of the old trees on the river-bank into the far distance. “I have,” he responded. “It is a piece of impertinence, because I have no right to say it to you.”

“You may say anything you wish to say,” Irene answered, while a vague apprehension took possession of her mind at something in his tone. “Surely we have known each other long enough for that.”

“Well,” the other blurted out with an abruptness that showed the effort that it cost him, “you should be married, Irene.”

Irene felt like bursting into tears, but with truly feminine fortitude she managed to smile instead.

“Am I getting so woefully old and faded, then, Arthur?” she asked.