four o'clock
`` May need it worse later than we do now . '' Percy could easily have eaten twice his share , but he recognized the wisdom of Jim 's decision . Both were very thirsty , but without a drop of fresh water aboard there was nothing to do but wait . At four o'clock came disaster . The drug suddenly let go ! Round whirled the dory , side to the seas . Jim grabbed the oar and jammed it into the scull-hole , but before he could wet the blade a crumbling roller almost swamped the boat .