twelve o’clock
The doctor vainly sought for a current of air at different heights , and , at last , seeing this calm of all nature , he resolved to pass the night afloat , and , for greater safety , rose to the height of one thousand feet , where the balloon remained motionless . The night was magnificent , the heavens glittering with stars , and profoundly silent in the upper air . Dick and Joe stretched themselves on their peaceful couch , and were soon sound asleep , the doctor keeping the first watch . At twelve o'clock the latter was relieved by Kennedy . `` Should the slightest accident happen , waken me , '' said Ferguson , `` and , above all things , do n't lose sight of the barometer . To us it is the compass ! '' The night was cold .