The substance of this book has already appeared in the form of articles in the pages of the Oil and Colourman's Journal. These articles were received with so much favour by the readers of that Journal that it has been thought desirable to collect them together and reprint them in book form. For this purpose the articles have been thoroughly revised and new matter added to bring the subject up to date. The author has not attempted to write a complete treatise on Soap Manufacture, but has aimed at presenting in a brief but, it is hoped, clear manner the principal processes of soap manufacture, with an account of the raw materials used and the scientific principles which underlie the various operations. The author here acknowledges his indebtedness to several engineering firms for the loan of machinery blocks wherewith to illustrate the chapter on Soap Machinery.