Mode of investigation.-Intellect.-Sense-perceptions.—Association.—
Inference and understanding.-Rational intelligence.-Modes of mental or
nervous action.-Reflex action, unconscious and comparatively mechanical.
-Instinctive action: The actor is conscious, but guided by heredity.-In-
telligent action.—The actor is conscious, guided by intelligence resulting
from experience or observation. The will stimulated by motives.—Appe-
tites.-Fear and other prudential considerations.-Care for young and love
of mates.-The dawn of unselfishness.-Motives furnished by the rational
intelligence: Truth, right, duty.-Recapitulation: The will, stimulated by
ever higher motives, is finally to be dominated by unselfishness and love
of truth and righteousness.-These rouse the only inappeasable hunger,
and are capable of indefinite development.-Strength of these motives.
Their complete dominance the goal of human development.
eration, or, rarely, to stagnation.-Natural selection becomes more un-
The reversal of the sequence of functions leads to extermination, degen-
sparing as we go higher.-Extinction.-Severity of the struggle for life.-
Environment one.-But lower animals come into vital relation with but a
small part of it. It consists of a myriad of forces, which, as acting on a