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Amazon.com   p. vii         What do we know and what do we not
know? Our data, and the things for which we seek. The unknown
mistaken for the known. Matter and motion. What does the
positive philosophy come to? Identity of the unknown: x=y, y=x.
What we really know. The existence of consciousness in us, and
of the world outside of us. Dualism or monism.? Subjective and
objective knowledge. Where do the causes of the sensations lie?
Kant's system. Time and Space. Kant and the "ether." Mach's
observation. With what does the physicist really deal?     A new
view of the Kantian problem. The books of Hinton. The "space-
sense" and its evolution. A system for the development of a
sense of the fourth dimension by exercises with colored cubes.
The geometrical conception of space. Three perpendiculars—why
three? Can everything existing be measured by three
perpendiculars? The indices of existence. Reality of ideas.
Insufficient evidence of the existence of