Heavens! The Snark’s time was not as good as Greenwich time. When it was 8:25 at Greenwich, on board the Snark it was only 8:9. “Greenwich time best, longitude west.” There I was. In west longitude beyond a doubt. Some day, when I have made a lot of money, I’m going to build a big ship, with room in it for a thousand volunteers. They will have to do all the work of navigating that boat around the world, or they’ll stay at home. I believe that they’ll work the boat around the world, for I know that Adventure is not dead. I know Adventure is not dead because I have had a long and intimate correspondence with Adventure.!

I assured him that if he really did let go and have a swim the sharks would promptly appear. This was a bluff on my part. I didn’t believe it. It lasted as a deterrent for two days. The third day the wind fell calm, and it was pretty hot. The Snark was moving a knot an hour. Bert dropped down under the bowsprit and let go. And now behold the perversity of things. We had sailed across two thousand miles and more of ocean and had met with no sharks. Within five minutes after Bert finished his swim, the fin of a shark was cutting the surface in circles around the Snark. CHAPTER III

Felicite imagined that Havana was a place where people did nothing but smoke, and that Victor walked around among negroes in a cloud of tobacco. Could a person, in case of need, return by land? How far was it from Pont-l’Eveque? In order to learn these things, she questioned Monsieur Bourais. He reached for his map and began some explanations concerning longitudes, and smiled with superiority at Felicite’s bewilderment. At last, he took a pencil and pointed out an imperceptible black point in the scallops of an oval blotch, adding: “There it is.” She bent over the map; the maze of coloured lines hurt her eyes without enlightening her; and when Bourais asked her what puzzled her, she requested him to show her the house Victor lived in. Bourais threw up his hands, sneezed, and then laughed uproariously; such ignorance delighted his soul; but Felicite failed to understand the cause of his mirth, she whose intelligence was so limited that she perhaps expected to see even the picture of her nephew! “Yes, yes, I know that,” I went on; “but what does it mean in your hands?” But other troubles and doubts awaited me. Here is a sample of one. In south latitude, when the sun is in northern declination, chronometer sights may be taken early in the morning. I took mine at eight o’clock. Now, one of the necessary elements in working up such a sight is latitude. But one gets latitude at twelve o’clock, noon, by a meridian observation. It is clear that in order to work up my eight o’clock chronometer sight I must have my eight o’clock latitude. Of course, if the Snark were sailing due west at six knots per hour, for the intervening four hours her latitude would not change. But if she were sailing due south, her latitude would change to the tune of twenty-four miles. In which case a simple addition or subtraction would convert the twelve o’clock latitude into eight o’clock latitude. But suppose the Snark were sailing southwest. Then the traverse tables must be consulted.