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In this conquest of nature by man there are three stages
distinguishable:
1. The Appropriative Period
2. The Adaptive Period
3. The Creative Period
These eras overlap, and the human race, or rather its vanguard,
civilized man, may be passing into the third stage in one field of human
endeavor while still lingering in the second or first in some other
respect. But in any particular line this sequence is followed. The
primitive man picks up whatever he can find available for his use. His
successor in the next stage of culture shapes and develops this crude
instrument until it becomes more suitable for his purpose. But in the
course of time man often finds that he can make something new which is
better than anything in nature or naturally produced. The savage
discovers. The barbarian improves. The civilized man invents. The first
finds. The second fashions. The third fabricates.
The primitive man was a troglodyte. He sought shelter in any cave or
crevice that he could find. Later he dug it out to make it more roomy
and piled up stones at the entrance to keep out the wild beasts.


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