As usual, he took the nine-o'clock watch, and at midnight d**k relieved him.
"Keep a sharp lookout, d**k!" was the doctor's good-night injunction.
"Is there any thing new on the carpet?"
"No; but I thought that I heard vague sounds below us, and, as I don't exactly know where the wind has carried us to, even an excess of caution would do no harm."
"You've probably heard the cries of wild beasts."
"No! the sounds seemed to me something altogether different from that; at all events, on the least alarm don't fail to waken us."
"I'll do so, doctor; rest easy."
After listening attentively for a moment or two longer, the doctor, hearing nothing more, threw himself on his blankets and went asleep.
The sky was covered with dense clouds, but not a breath of air was stirring; and the balloon
