THIS book has been prepared in response to a request from a number of teachers of psychology in the universities who suggested that the expense and length of my Handbook of Psychology precluded its use as the text in their courses of instruction. I have, accordingly, aimed to make a book which shall present the newest essentials of the science in a single compact volume at reasonable cost. It differs from my larger work mainly in its omissions. I have endeavored, however, to simplify the exposition throughout, often rewriting whole sections or recasting whole chapters with this in view, and adding more illustrative facts and explanations.
The treatment of the nervous system has been put at the beginning--a pedagogical concession to my critics, to which I ask attention as unanimous as their criticism. In regard to other alterations--respecting which the critics' opinions have largely neutralized one another--I have depended as before mainly on my own judgment. What these alterations are the book is here to show. I am sorry that the doctrine of "Feeling" has not aroused the approval in its readers that the doctrine of "Belief" has. It is stated more clearly in this book; but it is the same doctrine, and--may everybody be converted! Finally, I have added before the first chapter a short glossary of terms likely to embarrass the student at the beginning of his study; and instead of burdening the pages with references to the authorities, I have given at the outset once for all the general works (English mainly) in which detailed and