In the grades the book cannot be put into the hands of the pupils, but it should be mastered by the teacher and applied in her supervising and teaching activities. Embodying, as it does, the results of researches in educational psychology, it should prove especially suitable for use in teachers' reading circles where a concise presentation of the facts regarding the psychology of the learning process is desired. There is another group of students who need training in methods of study. Brain workers in business and industry feel deeply the need of greater mental efficiency and seek eagerly for means to attain it. Their earnestness in this search is evidenced by the success of various systems for the training of memory, will, and other mental traits. Further evidence is found in the efforts of many corporations to maintain schools and classes for the intellectual improvement of their employees. To all such the author offers the work with the hope that it may be useful in directing them toward greater mental efficiency. In courses in Methods of Study in which the book is used as a class-text, the instructor should lay emphasis not upon memorization of the facts in the book, but upon the application of them in study. He should expect to see parallel with progress through the book, improvement in the mental ability of the students. Specific problems may well be arranged on the basis of the subjects of the curriculum, and students should be urged to utilize the suggestions immediately. The subjects treated in the book are those which the author has found in his experience with college students to constitute the most frequent sources of difficulty, and under these conditions, the sequence of topics followed in the book has seemed most favorable for presentation. With other groups of students, however, another sequence of topics may be found desirable; if so, the order of topics may be changed. For example, in case the chapter on brain action is found to presuppose more physiological knowledge than that possessed by the students, it may be omitted or may be used merely for reference when enlightenment is desired upon some of the physiological descriptions in later chapters. Likewise, the chapter dealing with intellectual difficulties of college students may be omitted with non-collegiate groups.