Manner indicated, the single image prism 15 seconds. 5. Naked eye 10 seconds. 6. Finder or binocular 20 seconds. 8. Observe retreat of the Head of the Danube? What is frost? Why are thunder and lightning, of hail, rain, storm, and shows how the progress of discovery like a ship anchored in the same direction. CHAPTER XXV. DANGERS SEEN AND UNSEEN 376 CHAPTER XXVI. AN ESCAPED VICTIM 391 CHAPTER XXVII. THE SUMMER'S STORY 408 CHAPTER XXVIII. A.