ERRATA
| Page | 133, line 27, for “200 stars” read “200 stars per hour.” |
| " | 145, See note on page 220. |
| " | 146, bottom of page. This nebulosity was first discovered by Dr. Max Wolf of Heidelberg. See Astr. Nachr. 3736. |
| " | 181, line 17, for “observation” read “aberration.” |