ten o'clock
A speck of light was sailing across the sky ! But their faces fell as it drew closer . `` Only an airplane , '' Bud grumbled . At ten o'clock Mr. Swift gave a weary yawn . `` The spirit is willing but the flesh is weak , '' he confessed . `` I got only two hours of sleep on the space wheel , and apparently last night was n't enough to catch up . Sorry , fellows . ''