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THE PROGRESS OF SCIENCE.
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![](http://upload.wikimedia.org/wikipedia/commons/thumb/7/7a/PSM_V61_D193_Global_map_of_volcanic_disturbances.png/540px-PSM_V61_D193_Global_map_of_volcanic_disturbances.png)
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. |