In many ways "The Twilight of the Idols" is one of Nietzsche's most brilliant books. Being more compact, it consequently possesses a greater degree of precision and clarity than is found in his more analytical writings. It is not, however, a treatise to which one may go without considerable preparation. With the exception of "Thus Spake Zarathustra," it demands more on the part of the reader than any of Nietzsche's other books. It is, for the most part, composed of conclusions and comments which grow directly out of the laborious ethical research of his preceding volumes, and presupposes in the student an enormous amount of reading, not only of Nietzsche's own writings but of philosophical works in general. But once equipped with this preparation, one will find more of contemporary interest in it than in the closely organised books such as "Beyond Good and Evil" and "The Genealogy of Morals." There are few points in Nietzsche's philosophy not found here. For a compact expression of his entire teaching I know of no better book to which one might turn. Nietzsche himself, to judge from a passage in his _"Ecce Homo"_ intended this book as a statement of his whole ethical system. He probably meant that it should present _in toto_ the principal data of his foregoing studies, in order that the reader might be familiar with all the steps in his philosophy before setting forth upon the formidable doctrines of "The Will to Power." Obviously, therefore, it is not a book for beginners. Being expositional rather than argumentative, it is open to misunderstanding and misinterpretation. It contains apparent contradictions which might confuse the student who has not followed Nietzsche in the successive points which led to his conclusions, and who is unfamiliar with the exact definitions attached to certain words relating to human conduct. Other qualities of a misleading nature are to be encountered in this book. Many of the paragraphs have about them an air of mere cleverness, although in reality they embody profound concepts. The reader ignorant of the inner seriousness of Nietzsche will accept these passages only at their surface value. Of the forty-four short epigrams which comprise the opening chapter, I have appended but three, for fear they would be judged solely by their superficial characteristics. Many of the other aphorisms throughout the book lend themselves all too easily to the same narrow judgment.