intelligence, less logical, less scientific in the application of
that knowledge, than is the man. The animal that could not make
accurate scientific observations of its surroundings, and deduce
accurate scientific conclusions from them, would soon pay the
penalty of its lack of logic.

What is true of man's precursors in the animal scale is, of
course, true in a wider and fuller sense of man himself at the
very lowest stage of his development. Ages before the time which
the limitations of our knowledge force us to speak of as the dawn
of history, man had reached a high stage of development. As a
social being, he had developed all the elements of a primitive
civilization. If, for convenience of classification, we speak of
his state as savage, or barbaric, we use terms which, after all,
are relative, and which do not shut off our primitive ancestors
from a tolerably close association with our own ideals. We know
that, even in the Stone Age, man had learned how to domesticate
animals and make them useful to him, and that he had also learned
to cultivate the soil. Later on, doubtless by slow and painful
stages, he attained those wonderful elements of knowledge that
enabled him to smelt metals and to produce implements of bronze,
and then of iron. Even in the Stone Age he was a mechanic of
marvellous skill, as any one of to-day may satisfy himself by
attempting to duplicate such an implement as a chipped
arrow-head. And a barbarian who could fashion an axe or a knife
of bronze had certainly gone far in his knowledge of scientific
principles and their practical application. The practical
application was, doubtless, the only thought that our primitive
ancestor had in mind; quite probably the question as to
principles that might be involved troubled him not at all. Yet,