Extermination.

By the toll of a billion deaths man has bought of the earth, and it is his against all comers; it would still be his were the Aliens More times as mighty as they are. For neither do humans live nor die in vain. We must remember what ruthless and utter destruction our own species has made not only upon animals, such as vanished bison and the dodo, but upon its own inferior races. The # # # a n Tigers . . . were entirely swept out of existence in a war of extermination waged by European immigrants, in the space if many years. Are we of mercy as to complain if the aliens warred in the same spirit?