262 Tommy Twisters Discovery ark with. The jam was quickly shot into the hold, sending up a tremendous cloud of fragrant steam. “We mustn’t let the heat out,” cried Tommy. ‘Be quick and help me put on the hatches—that’s it.” The jam was completely boxed in now so that no more steam escaped, for Tommy had carefully prepared for that. Then away they went down the big river, on the stream. People on the bank stopped to admire the ark as it floated gracefully down, for it had a very gay and beautiful effect with its pretty red roof painted to represent tiles and so make it look as much like Noah’s own ark as possible. Its sides were white, with windows painted on them in blue; though whether these had really been copied directly from Noah’s ark itself, or whether the artist had only done them from hearsay, I do not know; though they might be able to tell you at the Lowther Arcade. There were no real windows, because these would have let out the heat ; and the idea was to keep the heat in.