The natural principles of beauty

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

A nomenclature of colours

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