원문 (영어)

CHAPTER I A MYSTERIOUS VISITOR "Boys! B-o-y-s!" There was no response to the imperative summons. Professor Zepplin sat up in his cot, listening intently. Something had awakened him suddenly, but just what he was unable to decide. "Be quiet over there, young men," he admonished, adding in a lower tone, "I'm sure I heard some one moving about." The camp of the Pony Rider Boys lay wrapped in darkness, the camp-fire having long since died out. Not a sound disturbed the stilln