"Oh! It won't be rough," said Russ, with much assurance. "I heard Daddy say we were going to sail into summer seas. And that must be warm and pleasant water. Don't you think so?" Rose was looking over the rail now. She pointed. "That doesn't look as though the water was warm," she cried. "See the lumps of ice, Russ? It must be ice water. Where do you suppose the summer seas are?" "We are going to them," declared her brother with confidence. "Daddy said so. He said we would go out to a place he called the Gulf Stream and that the water would be warm there and the air would be warmer, too." "What do you think of that?" gasped Rose. "A stream in an ocean? I guess he was joking." "Oh, no, he wasn't. He said it real serious. He told Aunt Jo about it." "But how can a stream--that means a river--be running in the ocean? There wouldn't be any banks!" declared the doubtful Rose. "Let's go and ask him about it," suggested Russ. "And we'll want to keep on the lookout for that Gulf Stream too. I wouldn't want to go past it without seeing it." They were just about to hunt for Daddy Bunker in the crowd on deck when Laddie came running to them. He was very much excited and he could hardly speak when he reached his older brother and sister. "Oh! Oh! Oh!" gasped the smaller boy. "What is the matter, Laddie?" demanded Russ. "If it is another riddle, Laddie, take your time. We'll stop and listen to it." "It isn't a riddle--Yes, it is, too! I guess it's a sort of riddle, anyway," said Laddie. "Have you seen him?" "That sounds like a riddle," said Rose. "And of course we haven't seen him. What is the answer?" "Who is it that you are asking your riddle about?" demanded Russ. "Mun Bun," declared Laddie, breathing very hard, for he had run all the way from the stateroom. "Mun Bun isn't a riddle," said his sister. "He can't be." "Well, he's lost," declared Laddie. "We can't find him. He was there one minute, and just the next he was gone. And Mother can't find him, and Vi's gone to hunt for Daddy, and--and--anyhow, Mun Bun has lost himself and we don't any of us know what has become of him." CHAPTER VI THE SEA-EAGLE Mun Bun was not a very disobedient little boy; but as Daddy Bunker said, he had a better "forgetery" than he had memory. Mun Bun quite forgot that Mother Bunker had told him not to leave the bigger stateroom where she was setting things to rights in her usual careful way. For, as they were to be several days on the steamship, she must have a place for things and everything in its place, or she could not comfortably take care of Daddy and six children. Then, Mun Bun was so quick! Just as Laddie said: one minute he was there, and the next minute he wasn't. He seemed to glide right out of sight. Cowboy Jack had called Mun Bun a blob of quicksilver; and you know you cannot put your finger on a blob of quicksilver, it runs so fast.