The question, of course, is as to whether he should not then resign himself to keeping still, and letting others do the further speaking.
There is much to be said for such a course.

But if one have the right to print more severe and difficult things, and think he really has something to say which would instruct the larger audience, it would seem only fair to allow him to speak in the simpler way also, even though all that he says may not have the merit of escaping the charge of infringing his own copyrights! I am indebted to the proprietors of the following magazines for the use of such passages: The Popular Science Monthly, The Century Magazine, The Inland Educator; and with them I also wish to thank The Macmillan Company and the owners of Appletons' Universal Cyclopaedia.
As to the scope and contents of the Story, I have aimed to include enough statement of methods and results in each of the great departments of psychological research to give the reader an intelligent idea of what is being done, and to whet his appetite for more detailed information.

In the choice of materials I have relied frankly on my own experience and in debatable matters given my own opinions.

This gives greater reality to the several topics, besides making it possible, by this general statement, at once to acknowledge it, and also to avoid discussion and citation of authorities in the text.

At the same time, in the exposition of general principles I have endeavoured to keep well within the accepted truth and terminology of psychology.
It will be remarked that in several passages the evolution theory is adopted in its application to the mind.