| MACDONALD & CO. | 53 |
| MACKIE | 36 |
| MACLAREN | 14 |
| McMAHON | 43 46 |
| MACONOCHIE | 42 |
| MACPHERSON | 10 |
| Magnesium | 60 |
| Magnetite | 9 10 11 13 14 15 16 24 29 30 31 34 35 37 38 41 42 45 46 49 50 51 53 54 55 57 58 62 65 67 |
| Maltese Islands | 22 48 |
| Mammoth | 72 |
| Marble | xxi |
| Margarites | 69 |
| Marine-glue | xxii |
| Markfield | 65 66 |
| Markt Schorgast | 57 |
| Marl, foraminiferal | 22 |
| Martite | 29 67 68 |
| Matrix, devitrified | 33 41 |
| Megascopic slides | xxiv xxviii |
| Melanite | 27 28 61 |
| Melaphyre | 45 |
| Melbourn-rock | xxi |
| Melitite | 27 |
| Melitite, basalt | 60 |
| Menai-Bridge | 39 |
| Menheniot | 23 |
| MERIEN | 28 |
| Mesh-structure | 43 |
| Metamorphism, dynamic | 29 36 54 |
| Metamorphism, fissures of | 41 42 |
| Metamorphism, thermal | 29 44 |
| Methylated spirit | ix xvi xxiii |
| MEYER | 32 |
| Mica, Lamprophyre | 34 |
| Mica, schist | 54 |
| Micaceous haematite | 52 |
| Microcline | 27 36 |
| Micro-chemical tests | 26 28 64 |
| Microlites | 13 24 27 61 62 69 70 |
| Microgranite | 47 50 |
| Micrographic intergrowths | 1 11 34 37 38 53 |
| Micro-pegmatite | 1 45 65 66 |
| MIERS | 60 63 64 |
| Miliolidae | 5 |
| Miocene | xxii 48 56 |
| Modern methods of research | i |
| MOHS'S scale | iii 60 |
| Mollusca | 18 32 40 48 63 72 |
| Monoliths, Egyptian | 65 |
| MONTGOMERIA stone | v |
| Monzonite | 11 42 |
| Mosaics, calcite | 32 40 48 63 71 72 |
| Mosaics, quartz | 60 |
| Mosedale | 1 |
| Mount Sorrel | 38 55 |
| Mounting rock sections | x xii xiv |
| Mounting-tile | xv |
| Muckraw | 37 |
| Mudstones | 40 |
| Munchberg | 58 |
| MURRAY, SIR JOHN | 4 6 22 48 |
| Muscovite | 35 39 |
| Muslin | XVII |
| Mynydd Mawr | 47 50 |
|