PLATES
| Page | ||
| Photograph of the nebula of Orion | [Frontispiece] | |
| Table of coloured spectra | Plate I. | [facing pg.127] |
| Coloured double stars | Plate II. | [facing pg.167] |
| Page | ||
| Photograph of the nebula of Orion | [Frontispiece] | |
| Table of coloured spectra | Plate I. | [facing pg.127] |
| Coloured double stars | Plate II. | [facing pg.167] |