| Sable brushes | ix xvi |
| Sable stripers | xvi |
| Sagenite | 52 |
| Sale Fell | 34 |
| Salisbury Crags | 15 |
| Salopian-type | 40 |
| Salt cubes | xvi |
| Sand-grains | 36 52 |
| Sandstone | 36 |
| Sanidine | 25 26 27 46 50 61 67 70 |
| 'Sarcen-stones' | 20 |
| Saucers, artists' nest of | ix |
| SAUSSURE | 64 |
| Schemnitz | 69 |
| Shillerisation | 2 23 24 30 49 |
| Schist, garnetiferous mica | 54 |
| Schist, glaucophane | 39 |
| Schist, hornblende | 29 |
| Schistose-Complex | 39 |
| SCHOMBURGK | 56 |
| Schorl | 59 60 |
| Schorl, granite | 59 |
| Schorl, rock | 59 |
| Scopulites | 69 |
| Sealing slides | xv |
| Seaside sands | xix |
| Secondary alteration | 52 |
| Sections, thinness of | ix |
| 'Selfs' | 71 |
| SEMMONS | 60 |
| SENFT | 60 |
| Serpentine | 7 8 13 14 15 16 22 23 24 29 30 41 42 43 45 |
| SHADBOLT's turntable | xvi |
| Shagreened | 41 |
| Shales | xxii 40 |
| Shap | ii |
| Shellac | vi xvi |
| Shellac solution | xxiii |
| Sheffield Quarry | 59 |
| Siebengebirge | 67 |
| Silica, in granites | 66 |
| Silica, in limestones | 72 |
| Silica, secondary | 19 59 60 |
| Silica, in syenites | 66 |
| Siliceous earth | 56 |
| Silicide of carbon | ii |
| Silicide of iron | 36 |
| Silk rag | xvi |
| Silurian | xxii 34 40 |
| Siluro-Cambrian | 57 |
| Simultaneous crystallisation | 45 |
| Skeleton crystals | 14 31 |
| Skiddaw | xxi xxii |
| Slate, chiastolite | xxi xxii 44 |
| Slate, clay | 52 |
| Slides, finishing | xv |
| Slides, magascopic | xxiv xxviii |
| Slides, sealing | xv |
| Slides, storage | xxviii |
| Slips, cleaning | xii |
| Smaragdite | 57 |
| SMYTH | 30 |
| Snowdon | 47 |
| Socotra | 47 |
| Soda, bicarbonate | xix |
| Soda, wasing | 56 |
| Soda-amphibole | 47 |
| Soda-pyroxene | 27 46 |
| Soft-rock sections | xviii |
| Soils, study of | i |
| SOLLAS | 35 36 |
| SORBY | xviii 18 36 64 66 72 |
| Sorrel, Mount | 38 55 |
| South Atlantic Ocean | 4 |
| Speeton | xxi |
| Sphene | 11 12 27 28 38 51 53 |
| 'Spheres' in Chalk | xxii |
| Spherulites | 31 33 61 |
| Spherulitic Felsite | 33 |
| Spherulitic Obsidian | 31 |
| Spinellid | 43 |
| Spirit, methylated | ix xvi xxiii |
| Sponge spicules | xx 4 32 40 56 |
| Spumellaria | 56 |
| Stafforshire | 40 71 72 |
| Statuary marble | xxi |
| Stellites | 69 |
| Stenzelberg | 67 68 |
| Stone, Bargate | 32 |
| Stone, Ingham | 19 |
| Sone, Montgomerie | v |
| Stone, Tam O'Shanter | v |
| Stone, Water-of-Ayr | xxiii |
| Storage of slides | xxviii |
| Straight extiniction | 43 |
| Strain shadows | 36 54 |
| 'Strings' of pores | 47 53 55 57 |
| Stripers of sable-hair | xvi |
| Structure, augen or eye | 52 54 |
| Successive crystallistation | 45 |
| Sulphide of iron | 3 |
| Sulphuric acid | xx |
| Sutherland | 51 |
| Swallow Craig | 9 |
| Syene | 49 65 |
| Syenite, augitic | 49 |
| Syeniye, basic | 42 |
| Syenite, granophyric | 65 |
| Syenite, leucite-melanite | 51 |
| Symmetrical extinction | 2 |
| Syringopora ramulosa | 71 |
|