TABLE OF CONTENTS.
Reading edition
The Orion Nebula,Frontispiece
The Crossley Reflector of the Lick Observatory, Page11
List of Nebulæ and Clusters Photographed, "30
Catalogue of New Nebulæ Discovered on the Negatives, "31
Positions of Known Nebulæ Determined from the Crossley Negatives, "42
List of Illustrations, "45
Illustrations,following"46