The kind way in which a former book of mine, "Lessons on Decorative Design," was received by critics, teachers, and students, has led me to yield to a widely expressed desire that I should write a more advanced work on the same subject. Hence the present volume, which, I trust, may be of service to those for whom it is specially designed. Like the previous volume, it does not pretend to be a book of designs, but a book on design - not a picture book, but a school text-book.<br><br>The illustrations and diagrams have been selected and designed with the view of explaining principles and directing practice. Many of them are reproductions of impromptu sketches drawn on the blackboard while lecturing to my classes. Throughout the work I have insisted on the observance of principles, regard for construction, and the law of development.