thought."
The most difficult problems in life are susceptible of more or less
perfect solution if approached by the method of evolution. They cannot
be even stated as problems in any other terms. In every science worthy
of the name the history of origins and the study of developing forces
must take a leading part.

_Evolution as a System of Cosmic Philosophy._ In a fourth sense the word
evolution has been applied to the philosophical conceptions to which the
theory of evolution gives rise. Philosophy is not truth. When it is so
it becomes science. At the best it points the way to truth. The broader
the inductive basis of any system of philosophy, the greater its value
as an intellectual help. The system of Herbert Spencer, the greatest
exponent of the philosophy of evolution, is based wholly on the results
of scientific investigation. It consists of a series of more or less
broad and more or less probable deductions from the facts and laws
already known. Systems like these, which rest on scientific knowledge,
do not rise high above it. They can therefore be revised or rewritten as
knowledge increases. They provide the means for their own correction.
Systems resting on aphorisms or assumptions or definitions must
disappear as knowledge increases.

Philosophy is never wholly identical with truth. The partial truth which
it may contain becomes wholly error with the advance of science. The
growth of exact knowledge transforms the truth in philosophy into
science, leaving the absolute falsehood as the final residuum.

From this necessary fact comes the ultimate decay of all creeds or
philosophic formulae. Throughout the ages science and philosophy have
been in conflict. Science is the same to all minds capable of grasping
its conclusions. Philosophy changes with the point of view. It is the
evanescent perspective in which the facts and phenomena of the universe
are seen. This can never be the same under changing times and
conditions. With the larger knowledge of to-morrow, there will be large
modifications in the accepted philosophy of evolution. Each succeeding
generation will give to the applications of the laws of organic life a
different philosophical expression.

II. WHAT EVOLUTION IS NOT.

In these four senses the word evolution is used with some degree of
accuracy. But in the current literature of the day the word has many
other meanings, some of them very far from any just basis. Some things
which evolution i