HOW DAVE FAILED TO PROFIT BY HIS EXPERIENCE. OF PAOLO TOSCANELLI AND CHRISTOPHER COLUMBUS. OF A NEW SHORE DAVE AND DOLLY REACHED BY EXPLORATION, ROUND THE CORNER; AND OF OTHER NAVIGATORS WHO HAD, IN THIS CASE, MADE IT FOR THEMSELVES. OF THE PUBLIC SPIRIT OF DAVE AND DOLLY, AND THE CONSTRUCTION OF A _BARRAGE_. HOW MRS. TAPPING AND MRS. RILEY HEARD THE ENGINES. OF A SHORTAGE OF MUD, AND A GREAT RESOLVE OF DAVE'S. WHY NOT SOME NEW MUD FROM THE NEW SHORE? The interest of Dave's accident told in the last chapter is merely collateral. It shows how narrow an escape the story that follows had not only of never being finished, but even of never being written. For if its events had never happened, it goes near to certainty that they would never have been narrated. Near, but not quite. For even if Dave had profited by these warnings, cautions, and moral lessons to the extent of averting what now appears to have been Destiny, some imaginative author might have woven a history showing exactly what might have happened to him if he had not been a good boy. And that history, in the hands of a master--one who had the organ of the conditional praeterpluperfect tense very large--might have worked out the same as this. The story may be thankful that no such task has fallen to its author's lot. It is so much easier to tell something that actually did happen than to make up as you go. Dave was soon as bad as ever--no doubt of it. Only he kept clear of that post. The burnt child dreads the fire, and the chances are that admonitions not to climb up on posts had less to do with his abstention from this one than the lesson the post itself had hammered into the back of his head. Exploration of the outer world--of the regions imperfectly known beyond that post--had so far produced no fatal consequences; so that Aunt M'riar's and Uncle Mo's warnings to the children to keep within bounds had not the same convincing character. But a time was at hand for the passion of exploration to seize upon these two very young people, and to become an excitement as absorbing to them as the discovery of America to Paolo Toscanelli and Christopher Columbus. At first it was satisfied by the _cul-de-sac_ recess on which Sapps Court opened. But this palled, and no wonder! How could it compete with the public highway out of which it branched, especially when there was a new shore--that is to say, sewer--in course of construction?