| The Orion Nebula, | Frontispiece | | The Crossley Reflector of the Lick Observatory, | | Page | 11 | | 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 |
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