A nomenclature of colours

The Geometric Beauty of the Human Figure Defined

Proportion

The laws of harmonious colouring

Original geometrical diaper designs

The orthographic beauty of the Parthenon referred to a law of nature. To which are prefixed a few observations on the importance of æsthetic science as an element in architectural education

The science of beauty

Catalogue Raisonné of the Works of D. R. Hay [by Himself]. with Critical Remarks by Various Authors

The natural principles of beauty

Die Gesetze der Farbenharmonie Vorzüglich Für Die Zwecke der Haus-, Studen- und Decorationsmalerei