about 11 o'clock
Henry was glad when it was their turn to sleep , and when he awoke , night had come with its cool shadows and a wind also that dispelled the breathless heat . Then they pulled out of the bushes and floated again with the stream , but they did not hoist their sail . The air after the close heat of the day was charged with electricity , and they looked for a storm . It came about 11 o'clock , chiefly as a display of thunder and lightning . The flashes of electricity dazzled them and continued without a break for almost an hour . The roar of the thunder was like the unbroken discharges of great batteries , but both wind and rain were light . Several times the lightning struck with a tremendous crash in the woods about them , but the boat glided on untouched .