Psychology,--the science of the human soul and its relations,--
under the mechanistic theory of life, must receive a new definition.
It becomes a science of man's activities as determined by the
environmental stimuli of his phylogeny and of his ontogeny.
On this basis we postulate that throughout the history of the race nothing
has been lost, but that every experience of the race and of the individual
has been retained for the guidance of the individual and of the race;
that for the accomplishment of this end there has been evolved through
the ages a nerve mechanism of such infinite delicacy and precision
that in some unknown manner it can register permanently within
itself every impression received in the phylogenetic and ontogenetic
experience of the individual; that each of these nerve mechanisms
or brain patterns has its own connection with the external world,
and that each is attuned to receive impressions of but one kind,
as in the apparatus of wireless telegraphy each instrument can
receive and interpret waves of a certain rate of intensity only;
that thought, will, ego, personality, perception, imagination,
reason, emotion, choice, memory, are to be interpreted in terms
of these brain patterns; that these so-called phenomena of human
life depend upon the stimuli which can secure the final common path,
this in turn having been determined by the frequency and the strength
of the environmental stimuli of the past and of the present.
Finally, as for life's origin and life's ultimate end,
we are content to say that they are unknown, perhaps unknowable.
We know only that living matter, like lifeless matter, has its own
place in the cosmic processes; that the gigantic forces which operated
to produce a world upon which life could exist, as a logical sequence,
when the time was ripe, evolved life; and finally that these cosmic
forces are still active, though none can tell what worlds and what
races may be the result of their coming activities.