| Gabbro | 1 24 29 37 |
| Gaerwen | 39 |
| Galena | 63 |
| GARDINER | 36 68 |
| Garendon | 65 66 |
| Garnet, black | 51 |
| Garnet, red | 54 57 |
| Garnetiferous mica-schist | 54 |
| Gasteropods | 40 |
| Gefrees | 44 |
| GEIKIE, SIR A. | 10 14 16 18 35 40 46 51 70 72 |
| Geognosy | i |
| Geological Survey | 3 50 |
| GERICHTEN, VON | 58 |
| Giant's Causeway | ii |
| Girvanella | 17 18 |
| Glashutte | 69 |
| Glass cavities | 67 68 |
| Glass, devitrified | 13 33 45 61 69 |
| Glass, isotropic | 13 41 45 46 50 |
| Glass, matrix | 31 41 68 69 |
| Glauconite | xxii 32 |
| Glaucophane-Schist | 39 |
| Globigerinae | xx 4 5 21 22 |
| Globigerinal Limestone | 21 |
| Globigerina-ooze | xix xxiii 4 21 |
| Globulites | 69 |
| Gneiss | 11 29 57 |
| Godalming | 32 |
| Goshi Quarries | 21 |
| Grammatite-like | 24 |
| Granites | ii 35 37 47 53 57 59 60 61 |
| Granites, binary | 35 |
| Granites, hornblende-biotite | 65 |
| Granites, difference from syenites | 66 |
| Granophure | 1 |
| Granophyric, diorite | 37 |
| Granophyric, syenite | 65 |
| Granular augite | 45 46 |
| Graphite pencils | xxv |
| GREENLY | 39 |
| Greenstone | 65 |
| GREGORY, MR. A. G. G. | 11 30 54 |
| GREGORY, PROF. | 48 |
| Greyweather | 20 |
| Grinding rocks | iv |
| Grinding rocks on cover-glasses | xx |
| Groby | 65 66 |
| GROOM | 3 |
| Ground-mass | 13 15 26 27 31 41 45 46 47 50 52 54 55 61 65 67 68 69 |
| Gun dammar | xvii xx |
| GUMBEL | 10 58 |
|