PREFACE
ILLUSTRATIONS
CHAPTER I
EARLY INSTRUMENTS
STRUCTURE OF THE UNIVERSE
MODERN METHODS
REFRACTORS AND REFLECTORS
100-INCH TELESCOPE
ATMOSPHERIC LIMITATIONS
CRITICAL TESTS
CLOSE DOUBLE STARS
CHAPTER II
STAR IMAGES
THE INTERFEROMETER
A LABORATORY EXPERIMENT
THE 20-FOOT INSTRUMENT
THE GIANT BETELGEUSE
STELLAR EVOLUTION
TWO OTHER GIANTS
CHAPTER III
SOLAR HELIUM
SUN-SPOTS AS MAGNETS
THE TOWER TELESCOPE
STELLAR CHEMISTRY
ASTROPHYSICAL LABORATORIES
NEWTON AND EINSTEIN
TRANSMUTATION OF THE ELEMENTS
COSMIC PRESSURES
PRACTICAL VALUE OF RESEARCHES ON THE CONSTITUTION OF MATTER
