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ADDITIONS AND CORRECTIONS.
| Page | Line | Erratum. | Correction. |
| 5 | 28 | TV | TU |
| 8 | 11 | 1r | 1q |
| 27 | 9 | GHP | GHp |
| 35 | 7 | EQ | Eq |
| 45 | 34 | Ra | RA |
| 46 | 27 | mRQ | M×RQ |
| 75 | 13 | Sv | sv |
| 84 | 6 | Gag | GAg |
| 88 |
21 |
Add: When the sphere is rarer than the surrounding medium, the form of caustic is such as represented in Fig. 126. | |
| 103 | 29 | Add: (See Fig. 153.) | |
| 130 | 4 | MvN | rAp |
| 140 | 20 | innermost or, | innermost arc |
| 179 | 38 | 220, 221, 222, | 222, 223, 224 |
| 186 | 17 | 223 | 225 |
