Volcanoes: What They are and What They Teach

Name: Volcanoes: What They are and What They Teach
Author: Judd, John W. (John Wesley)

Judd, John W. (John Wesley)

Volcanoes

39. Section of a small scoria-cone formed within the crater of
        Vesuvius in the year 1835, illustrating the filling up of
        the central vent of the cone by subsequent ejections.
        (_After Abich_)                                             122

  40. Volcanic cones composed of scoriæ, and breached on one
        side by the outflow of lava-currents. (_After Scrope_)      128

  41. Campo Bianco, in the Island of Lipari. A pumice-cone
        breached by the outflow of an obsidian lava-stream
                                                       _to face p._ 124

  42. Volcanic cones in Auvergne, which have suffered to some
        extent from atmospheric denudation. (_After Scrope_)        124

  43. Experimental illustration of the mode of formation of
        volcanic cones composed of viscid lavas. (_After Reyer_)    126

  44. The Grand Puy of Sarcoui, composed of trachyte, rising
        between two breached scoria-cones (Auvergne). (_After
        Scrope_)                                                    126

  45. Volcanic cone (Mamelon) composed of very viscid lava
        (Island of Bourbon). (_After Bory de St. Vincent_)          127

  46. Another Mamelon in the Island of Bourbon, with a crater
        at its summit. (_After Bory de St. Vincent_)                127

  47. Cliff-section in the Island of Madeira, showing how a
        composite volcano is built up of lava-streams, beds of
        scoriæ, and dykes. (_After Lyell_)                          125

  48. Section seen at the cascade, Bains du Mont Dore. (_After
        Scrope_)                                                    130

  49. Section in the Island of Ventotienne, showing a great
        stream of andesitic lava overlying stratified tuffs.
        (_After Scrope_)                                            130

  50. Cliff on the south side of the Island of San Stephano         131

  51. The headland of Monte della Guardia, in the Island of Ponza   131

  52. Western side of the same headland, as seen from the north
        side of Luna Bay                                            132

  53. Sea-cliff at Il Capo, the north-east point of Salina,
        showing stratified agglomerates traversed by numerous
        dykes, the whole being unconformably overlaid by
        stratified, aqueous deposits                                137

  54. Section observed in the Val del Bove, Etna, showing a
        basaltic dyke, from the upper part of which a
        lava-current has flowed                                     138

  55. Basaltic dykes projecting from masses of stratified scoriæ
        in the sides of the Val del Bove, Etna                      134

  56. Sheets of igneous rock (basalt) intruded between beds of
        sandstone, clay, and limestone (Island of Skye)             137

  57. Plan of the dissected volcano of Mull in the Inner
        Hebrides                                       _to face p._ 142

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Volcanoes: What They are and What They Teach

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