CONTENTS [PREFACE]I. [THE UNSOLVED PROBLEMS OF ASTRONOMY]II. [THE NEW PROBLEMS OF THE UNIVERSE]III. [THE STRUCTURE OF THE UNIVERSE]IV. [THE EXTENT OF THE UNIVERSE]V. [MAKING AND USING A TELESCOPE]VI. [WHAT THE ASTRONOMERS ARE DOING]VII. [LIFE IN THE UNIVERSE]VIII. [HOW THE PLANETS ARE WEIGHED]IX. [THE MARINER'S COMPASS]X. [THE FAIRYLAND OF GEOMETRY]XI. [THE ORGANIZATION OF SCIENTIFIC RESEARCH]XII. [CAN WE MAKE IT RAIN?]XIII. [THE ASTRONOMICAL EPHEMERIS AND NAUTICAL ALMANAC]XIV. [THE WORLD'S DEBT TO ASTRONOMY]XV. [AN ASTRONOMICAL FRIENDSHIP]XVI. [THE EVOLUTION OF THE SCIENTIFIC INVESTIGATOR]XVII. [THE EVOLUTION OF ASTRONOMICAL KNOWLEDGE]XVIII. [ASPECTS OF AMERICAN ASTRONOMY]XIX. [THE UNIVERSE AS AN ORGANISM]XX. [THE RELATION OF SCIENTIFIC METHOD TO SOCIAL PROGRESS]XXI. [THE OUTLOOK FOR THE FLYING-MACHINE]