"Chouse, will you promise to be a _really_ good dog if we take you with us?" Chouse answered Greta by barking three times, which meant, "Yes, I will." Chouse had not been allowed to go with the girls since the evening at Tivoli. Greta didn't want to send home any _more_ bad reports about him. Even now, she was almost afraid to open her father's letters, for each day she expected him to write that he had found a new home for Chouse. Sometimes Greta wished that her visit in Copenhagen could go on forever. Then she would never have to part with her pet. "We'll climb up in the Round Tower first of all," said Anna, as she and Greta and Chouse started off gaily for a day's wandering. "Then you can look over the city and decide what you want to see next." As they walked through the winding streets of the business district of Copenhagen, Anna told Greta the story of the famous Round Tower. "It was built more than three hundred years ago by King Christian the Fourth," she explained. "He wanted to do something that would make the people remember him always, so he built this high tower as an observatory, where scientists could study the stars." The Round Tower stood in the very heart of the city. At the time it was built it was the tallest building in Copenhagen, but now the Marble Church rose high above it. [Illustration: THE ROUND TOWER] Just before they reached the tower, Anna surprised Greta by saying, "This Tower is over a hundred feet high, but you won't have to climb a single step to reach the top." "But how do we get to the top?" "You'll see in just a minute, Greta." "Come, Chouse," called Greta, as the girls reached the door of the Round Tower. The dog had started down the street ahead of them. He seemed to be looking for something, but he ran back quickly when his little mistress called. Once inside the tower, the children started up a sloping walk that went up and up and up. At the same time it went round and round and round, like a corkscrew. Every little while Chouse dashed on ahead and then came running back, barking joyously. "This is the funniest tower I have ever seen," said Greta. "Does this walk go to the very top?" "Yes," answered Anna. "They say that a long time ago, when Peter the Great, the Czar of Russia, visited Denmark he rode up here on horseback, and at another time the Empress Catherine drove her coach and four up to the very top of the Round Tower." [Illustration: THE MARBLE CHURCH, AS SEEN FROM THE TOP OF THE ROUND TOWER] Greta stopped a moment to look at the winding, sloping walk. "I guess one really _could_ drive a coach up here. It seems to be wide enough."