“He continued his observations for seven or eight hours with General Morlot”

The unknown bowed his head in his hands, and reflected for some moments; then raising his head, he said,—

“Despite my prohibition, monsieur, you have opened the valve.”

I dropped the cord.

“Happily,” he resumed, “we have still three hundred pounds of ballast.”

“What is your purpose?” said I.

“Have you ever crossed the seas?” he asked.

I turned pale.