The book is intended principally to introduce to the beginner the methods of dye chemistry, and not merely to present a collection of recipes. To this end, the chapter on the practical work in the organic industrial laboratory has been reworked and enlarged in order to clarify all the important points. The chapter on analysis of dyes has been revised so that the student may gain some insight into this difficult field. Also, the section on the determination of light fastness has been rewritten, and we are grateful to Dr. Ris (Basel) for his contributions to this subject. These additions have increased the scope of the book. We hope that they have also increased its usefulness.