So a science is simply the accumulated, tested
knowledge, the proved group of facts about a subject, all that is known
of that subject to date. Hence, if psychology is a _science_, it is no
longer a thing of guesses or theories, but is a grouping of confirmed
facts about the mind, facts proved in the psychology laboratory even as
chemical facts are demonstrated in the chemical laboratory. Wherein
psychology departs from facts which can be proved by actual experience
or by accurate tests, it becomes metaphysics, and is beyond the realm of
science; for metaphysics deals with the realities of the supermind, or
the soul, and its relations to life, and death, and God. Physics,
chemistry, biology have all in their day been merely speculative. They
were bodies of theory which might prove true or might not. When they
_worked_, by actually being tried out, they became bodies of accepted
facts, and are today called sciences. In the same way the laws of the
working of the mind have been tested, and a body of assured facts about
it has taken its place with other sciences.
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