| PAGE |
| [Map of the Mendip District of Somerset], |
| showing Swallets, Caves, and Outlets | 5 |
| [The Great Gorge of Cheddar] | 16 |
| Photo by Dawkes & Partridge, Wells. | |
| [Romano-British Pottery, Coins, Human] | |
| Remains, etc., Wookey Hole Cave | 22 |
| Photo by H. E. Balch. | |
| [Hyæna Den and Badger Hole, Wookey Hole] | 23 |
| Photo by Bamforth, Holmfirth. | |
| [Plan and Section of Wookey Hole Cavern] | 25 |
| By H. E. Balch. | |
| [The Great Swallet on Bishop's Lot, Priddy] | 28 |
| Photo by Bamforth, Holmfirth. | |
| [St. Andrew's Well, Wells] | 29 |
| Photo by H. E. Balch. | |
| [Profile of the "Witch of Wookey,"] | |
| Wookey Hole Cavern | 46 |
| Photo by H. E. Balch. | |
| [Among the Pools, Wookey Hole Cavern] | 47 |
| Photo by H. E. Balch. | |
| [Mass of Stalagmite, Wookey Hole] | 48 |
| Photo by H. E. Balch. | |
| [In the First Chamber, Wookey Hole Cavern] | 49 |
| Photo by Bamforth, Holmfirth. | |
| [Stalactite Terrace, Wookey Hole] | 50 |
| Photo by H. E. Balch. | |
| [Great River Chamber, Wookey Hole] | 51 |
| Photo by Dawkes & Partridge, Wells. | |
| [Second Great Chamber, Wookey Hole] | 52 |
| Photo by Dawkes & Partridge, Wells. | |
| [Entrance of Third Chamber, Wookey Hole] | 53 |
| Photo by Dawkes & Partridge, Wells. | |
| [Stalactite Grotto: New Chambers], | |
| Wookey Hole Cave | 54 |
| Photo by H. E. Balch. | |
| [Stalactite Grotto, Wookey Hole] | 55 |
| Photo by Claude Blee. | |
| [Stalactite Pillars, Wookey Hole] | 56 |
| Photo by Claude Blee. | |
| [New Stalactite Grotto, Wookey Hole] | 57 |
| Photo by Bamforth, Holmfirth. | |
| [The Grille: New Chambers, Wookey Hole] | 58 |
| Photo by Bamforth, Holmfirth. | |
| [The Source of the Axe, Wookey Hole] | 59 |
| Photo by Bamforth, Holmfirth. | |
| [Entrance to Great Cavern of Eastwater] | 62 |
| Photo by Bamforth, Holmfirth. | |
| [Section of Eastwater Cavern] | 63 |
| By H. E. Balch. | |
| [The Descent of Eastwater Cavern], | |
| the Second Vertical Drop | 64 |
| From Sketch by H. E. Balch. | |
| [The Great Canyon, Eastwater Cavern] | 65 |
| From Sketch by H. E. Balch. | |
| [Entrance of Swildon's Hole] | 72 |
| Photo by M. Martel. | |
| [Waterfall, Swildon's Hole] | 73 |
| Photo by H. E. Balch. | |
| [Entrance of Stalactite Chamber], | |
| Swildon's Hole | 78 |
| Photo by Bamforth, Holmfirth. | |
| [Stalactite Curtains, Swildon's Hole] | 79 |
| Photo by Bamforth, Holmfirth. | |
| [Stalactite Chamber, Swildon's Hole] | 80 |
| Photo by Bamforth, Holmfirth. | |
| [Stalagmite Pillars in Gough's Great Cavern] | 84 |
| Photo by Gough, Cheddar. | |
| [The Pillars of Solomon's Temple], | |
| Gough's Caves, Cheddar | 85 |
| Photo by Gough, Cheddar. | |
| [Organ Pipes, Gough's Caves, Cheddar] | 86 |
| Photo by Gough, Cheddar. | |
| ["Niagara," A Stalagmite Fall], | |
| Gough's Cave, Cheddar | 87 |
| Photo by M. Martel. | |
| [In Cox's Cavern at Cheddar] | 92 |
| Photo by Bamforth, Holmfirth. | |
| [Great Rift Cavern, Cheddar Gorge] | 93 |
| Photo by Bamforth, Holmfirth. | |
| [Entrance to Lamb's Lair, Harptree] | 116 |
| Photo by Bamforth, Holmfirth. | |
| [Plan and Section of the Great Cavern] | |
| of Lamb's Lair | 117 |
| By H. E. Balch. | |
| [The "Beehive" Chamber, Lamb's Lair] | 118 |
| Photo by Bamforth, Holmfirth. | |
| [Stalactite Wall, Lamb's Lair] | 119 |
| Photo by Bamforth, Holmfirth. | |
| [Entrance to Great Chamber, Lamb's Lair] | 120 |
| Photo by Bamforth, Holmfirth. | |
| [Largest Chamber in Somerset], | |
| Lamb's Lair, Harptree | 121 |
| From Sketch by H. E. Balch. | |
| [Stalactites in Entrance Gallery], | |
| Lamb's Lair | 122 |
| Photo by Bamforth, Holmfirth. | |
| [The Ogo, near Abergele] | 128 |
| Photo by E. A. Baker. | |
| [Inside the Ogo, near Abergele] | 129 |
| Photo by E. A. Baker. | |
| [In the Ogo, near Abergele] | 130 |
| Photo by E. A. Baker. | |
| [A pre-Glacial Cave, Llandulas] | 132 |
| Photo by E. A. Baker. | |
| [On the Ceiriog] | 134 |
| Photo by E. A. Baker. | |
| [Upper Ceiriog Cave] | 135 |
| Photo by E. A. Baker. | |
| [Lower Ceiriog Cavern] | 136 |
| Photo by E. A. Baker. | |
| [In Stump Cross Cavern] | 140 |
| Photo by E. A. Baker. | |
| [The Pillar, Stump Cross Cavern] | 141 |
| Photo by E. A. Baker. | |
| [The Chapel: Stump Cross Cavern] | 142 |
| Photo by E. A. Baker. | |
| [Ricklow Cave in Flood] | 156 |
| Photo by G. D. Williams. | |
| [A Great Pillar: Mitchelstown Cavern] | 160 |
| Photo by E. A. Baker. | |
| [A Fairy Lantern: Mitchelstown Cavern] | 161 |
| Photo by E. A. Baker. | |