Note 280 — Chapter XL · THE MODERN VOLCANOES OF ICELAND AS ILLUSTRATIVE OF THE TERTIARY VOLCANIC HISTORY OF NORTH-WESTERN EUROPE
Reading edition
Op. cit. p. 25. The great lava-fields of Iceland are likewise dotted over with secondary craters or "hornitos" which have no direct connection with the magma below, but arise from local causes affecting the outflowing lava. They are grouped in hundreds over a small space.