| Cadgwith | 43 |
| Calcareous binding | 21 63 |
| Calcareous mud | 71 |
| Calciferous sandstone | 14 |
| Calcite | 16 18 23 32 34 38 40 48 63 64 66 71 72 |
| Calcite, mosaic | 32 40 |
| Calmene Blumenbachii | 40 |
| Cambrian | 51 52 |
| Ca,era lucida | xxv xxvi xxvii xxviii |
| Canada-balsam | vi vii ix x xii xx |
| Cape-Town | 60 |
| Carbide of silicon | ii |
| Carbon dioxide | 63 |
| Carbonaceous particles | 44 |
| Carbonate, ferrous | 63 64 |
| Carboniferous | 9 14 17 18 33 34 36 41 45 46 61 63 72 |
| Carborundum | ii v vi viii xxiii |
| Carlsbad twinning | 1 26 34 68 70 |
| Carrara | xxi |
| Carrock Fell | 1 |
| CARUS WILSON | 36 |
| Cementing rocks | v |
| Cements | v xvi xvii |
| Celyphytic | 23 30 |
| Cephalopods | 40 |
| Ceylon | 60 |
| Chalcedony, cryptocrystalline | 19 20 |
| Chalks | xxi xxii |
| Chalky Limestones | 21 |
| Challenger Expedition | xix xxiii 4 5 21 22 |
| CHAPMAN | 32 |
| Charnwood Forest | 38 55 65 66 |
| Chester's Quarry | 41 |
| Chiasmal impurities | 44 |
| Chiatolite-Slate | xxi xxii 44 |
| Chloritic matter | 2 9 15 16 23 33 34 35 37 38 42 52 54 65 66 |
| Christiania | 49 |
| Church Cove | 29 |
| Clastic grains | 36 |
| Clauckland Point | 33 61 |
| Clay-Slate | 52 |
| Clay, needles | 52 |
| Cleaning slips, etc. | xii |
| Cleavages, calcite | 40 |
| Cleavages, false | 44 |
| Cleavages, hornblende | 29 30 38 39 53 55 |
| Cleavages, intersecting | 29 30 38 39 40 |
| Cleavages, structure | 52 |
| CLEMENTS | 30 |
| Clicker Tor | 23 |
| Clift Hill | 65 66 |
| Clifton | 17 18 |
| Clinkstones | 25 |
| CLOUGH | 52 |
| Coal | xxii |
| Coccolith | 4 |
| Codrington, Barbados | 56 |
| Coelenterata | 18 |
| COHEN | 18 30 31 34 35 41 44 46 47 58 60 62 |
| COLE | 50 60 64 68 |
| Conchoidal fracture | 31 |
| COOKE | 22 56 |
| Copper-Hill Quarry | 35 |
| Corals | 40 48 72 |
| Cork-tipped tongs | vii |
| CORNISH | 72 |
| Cornstores | 20 |
| Cornwall | 23 25 29 35 43 59 |
| Corriegills | 33 61 |
| Coscinodiscus | 4 |
| COTTON AND JOHNSON | ii iv |
| Courts of Crystallisation | 31 61 62 70 |
| Coverack | 43 |
| Cover-glasses, cleaning | xii xiii xvi |
| Cover-glasses, grinding on | xx xxi |
| Cracks, perlitic | 69 70 |
| CRAIG | 35 |
| Crinoids | 17 32 40 63 71 72 |
| CROSS | 31 68 |
| Crustacea | 18 |
| Cryptocrystalline | 19 50 54 |
| Crystalline Schistose Complex | 39 |
| Crystallisation, courts of | 31 61 62 70 |
| Crystallisation, incipient | 55 |
| Crystallisation, simultaneous | 45 |
| Crystallisation, successive | 45 |
| Crystallites | 31 62 69 70 |
| Crystals, negative | 35 |
| Cubes of salt | xvi |
| Cumberland | xxi xxii 1 25 34 36 |
| Cumulites | 69 |
| Cyanite | 57 58 |
| Cymbalopora | 4 |
| Cyprus | 21 |
|