No. 418.] NESTS OF AMERICAN ANTS. 815 
that they contain the germs of promise, for the consensus of the 
biological sciences leads us at last to one point of view: “ We 
are prepared," as Mach says (98, p. 235), “ to regard ourselves 
and every one of our ideas as a product and a subject of uni- 
versal evolution ; and in this way we shall advance sturdily and 
unimpeded along the paths which the future will throw open 
to us." 
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