Hypothetical Section Illustrating Continental Elevation.
FIGURE 2.

Diagram of Junction between Dike and Lava.
FIGURE 3.

Outline of an Elliptic Crater.
FIGURE 4.

Hypothetical Section showing the Relation of Dikes to Volcanic Vents.
FIGURE 5.

Map illustrating the Linear Arrangement of Volcanic Islands in relation to Continental Coast-lines.
FIGURE 6.