The Elements of Psychology: A Textbook
Although the scientific method has been only recently applied to psychological investigation, it has produced a reconstruction of the sciences relating to the nature of man. It has not been found possible, however, to abandon the special method of self-analysis, or introspection, which alone furnishes the particular kind of facts upon which Psychology is based,—the phenomena of consciousness. By a careful application of this method by many observers, there has been accumulated a body of accepted facts universally admitted as verifiable.
This text-book has been gradually adapted to the practical needs of those who could devote to the study only a single term of about three months. Great stress has been laid upon the careful definition of words, a progressive analysis, and the emphasis of the central truths of the science.