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 learning the art of the orderly arrangement of thought, no previous knowledge is necessary of logic or of any science whatever. What is necessary is a willingness on the part of the readers not to resist but to aid the writer in furnishing their minds with simple imagery, derived from various departments of human life, including science.

The imagery will be used, not in order to prove any doctrine, but to facilitate the orderly arrangement of thought material. When we are trying to put our household goods in order, we find it useful to provide ourselves with convenient shelves, racks, and hooks on which to store them; when we are trying to put our thoughts in order, we find it advisable to fasten up in our memories a convenient framework of imagery on which we can register our thought-processes.

Let us think of Time as a mass of water in a pool or tank. That is to say, Time Past is the water. Time Future shall be represented by the air above it. Water is continually coming slowly in at the top of the pool, and trickling away below into cavernous depths out of sight.

The surface of the pool represents Time Present.