Geigy has pioneered in this field by publishing in England and on the Continent, carefully prepared volumes of graphs of the important variables that influence the application of Direct dyestuffs. This radical departure from technical literature previously available for the dyer's guidance met with approval exceeding all expectations, and requests for copies came from all parts of the world. Prompted by such an enthusiastic reception abroad, this North American edition has been prepared with confidence as to its value for dyers, textile chemists and students of the art of dyeing