"Far from it," was the answer. "The best part of the canal is still before us, at Trollhättan, although the next lake that we enter, Lake Vener, is a lovely sheet of water. It is the largest lake in Sweden, and I must visit one of the lighthouses." "And I must call upon one of the trolls when we get to Trollhättan," said Gerda, shaking her head with an air of importance. "I shall walk up the locks," said Birger. "You mean that you will walk down the locks," Erik corrected him. "After this the boat will go downstairs until we reach the Göta River." And when, on the last morning of the journey, they reached Trollhättan, with its famous waterfalls and rapids, the children went ashore and left the boat to walk down the steep hillside by itself, while they ran along beside the canal, or took little trips through the groves to get a better view of the falls. Gerda peered under the trees and bushes for a glimpse of the water witches, but she saw not one. "And now for your treasures," said Lieutenant Ekman, when they were once more on the boat and it was steaming down the Göta River to Göteborg. "I bought post-cards," Birger announced, and took a handful from his pocket. "Here are pictures of the giant staircase of locks at Trollhättan, Lake Vener at sunset, the fortress at Karlsborg, the castle at Vettersborg, and the great iron works at Motala." While Herr Ekman was examining the cards and asking Birger all sorts of questions about them, Gerda was busy spreading out her souvenirs on one of the deck chairs; and such a variety as she had! There was a box of soap, a bag filled with squares of beet-sugar, a tiny hammer made in the shape of the giant steam-hammer "Wrath" at Motala, a package of paper made at one of the great paper-mills, lace collars, a lace cap and some beautiful handkerchiefs from Vadstena. When her father turned his attention to her collection, he held up his hands in amazement. "Are all these things made in Sweden?" he asked. "And did you buy them all with one krona?" "They are all made in the towns and cities which we have visited," Gerda replied; "but they cost more than one krona. Mother gave me five kronor before we left home and asked me to buy handkerchiefs and laces at Vadstena. They are the best to be found anywhere in Sweden." "And how about your treasures, Erik?" asked Lieutenant Ekman, after he had admired Gerda's. Erik put his hand into his coat pocket and took out a box of matches. "These are from Norrköping," he said. From another pocket he took another box of matches. "And these are from Söderköping," he added. Then from one pocket and another he took boxes of matches of all sizes and kinds, each time naming the town where they were manufactured; while the twins and their father gazed at him in surprise. "But why so many matches?" asked Lieutenant Ekman, when at last the supply seemed to be exhausted. "You have matches enough there to light the whole world."