CAUSE OF EARTHQUAKES—HOBBS Qt7 
Justily, but there is every reason to suppose that the future will bring 
to the Laurentian region earthquakes which are comparable in 
intensity with those of 1663 and 1811. So long as light shocks con- 
tinue within the region, there is reason to believe that at least a 
partial relief from earth strain is being secured, and the date of the 
next destructive shocks is correspondingly removed farther into the 
future. Paradoxical as it may appear, the time for alarm will come 
whenever the region becomes abnormally quiescent. 
20837—27——_19 
