“I don’t know much about science,” she began, “but I should hardly have supposed—”

“It’s curious how nature varies the type of aviation,” he continued dreamily. “Now, the pigeon is, of course, a Zeppelin; whereas the sea urchin is obviously a balloon; and the thistledown an undirigible—”

“You’re making fun of me!” she accused, with sharp enlightenment.

“What else have you done to me ever since we met?” he inquired mildly.

“Now I am angry! I shall go home at once.”

A second far-away plop! set a period to her decision.

“So shall I,” said he briskly.

“Does that signal mean hurry up?” she asked curiously.

“Well, it means that I’m wanted. You go first. When will you come again?”

“Not at all.”