This page has been validated.
THE PROGRESS OF SCIENCE.
Map of Volcanic Disturbances. (From Bonney's 'Volcanoes' Putnam's Science Series.)
|||||||Signifies Extinct Volcanoes.|
|Signifies Active Volcanoes but is not intended to indicate either the number or the exact position.|
|- - - - - -||Signifies the probable direction of lines of weakness in the earth's crust.|