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The excerpt represents the core issue or deciding factor on which you must meditate, and is drawn from The Unseen World and Other Essays by John Fiske: region of our experience; yet the conclusions of geometry are
none the less true ideally, though in any particular concrete
instance they are only approximately realized. Just so with the
conception of a frictionless fluid. So far as experience goes,
such a thing has no more real existence than a line without
breadth; and hence an atomic theory based upon such an assumption
may be as true ideally as any of the theorems of Euclid, but it
can give only an approximatively true account of the actual
universe. These considerations do not at all affect the
scientific value of the theory; but they will modify the tenour
of such transcendental inferences as may be drawn from it
 The Unseen World and Other Essays |