seven o'clock
`` You may both return to your duty , '' added the principal . Both were astonished at being let off so easily ; but Mr. Lowington was satisfied that they spoke the truth , and had not intended to run away . The others were also ordered to attend to their duty , but with the intimation that their conduct would be investigated at the return of Sanford and Stockwell , who , with Ole , had left the party at Katherineholm . The signal for sailing was flying on board of the Young America , and at seven o'clock the squadron was under way , continuing the voyage `` up the Baltic . '' No notice seemed to be taken of the absence of Sanford and Stockwell , but everybody believed that the principal knew what he was about . The wind was tolerably fresh from the west-south-west , and the squadron made rapid progress through the water , logging ten knots all day . The students watched with interest the villages on the coast of Denmark , with their sharp , red roofs , and the swarms of fishing-boats moored in front of them .