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This
artificial barricade, this false facade, was gradually extended and
solidified until finally man could build a cave for himself anywhere in
the open field from stones he quarried out of the hill. But man was not
content with such materials and now puts up a building which may be
composed of steel, brick, terra cotta, glass, concrete and plaster, none
of which materials are to be found in nature.
The untutored savage might cross a stream astride a floating tree trunk.
By and by it occurred to him to sit inside the log instead of on it, so
he hollowed it out with fire or flint. Later, much later, he constructed
an ocean liner.
Cain, or whoever it was first slew his brother man, made use of a stone
or stick. Afterward it was found a better weapon could be made by tying
the stone to the end of the stick, and as murder developed into a fine
art the stick was converted into the bow and this into the catapult and
finally into the cannon, while the stone was developed into the high
explosive projectile.


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