In 4to, 16 Plates, price 30s., THE GEOMETRIC BEAUTY OF THE HUMAN FIGURE DEFINED. To which is prefixed, a SYSTEM of ÆSTHETIC PROPORTION applicable to ARCHITECTURE and the other FORMATIVE ARTS. _From the Cambridge Journal of Classical and Sacred Philology._ We feel bound to pay Mr Hay a large and glad tribute of praise for having devised a system of proportions which rises superior to the idiosyncrasies of different artists, which brings back to one common type the sensations of Eye and Ear, and so makes a giant stride towards that _codification_ of the laws of the universe which it is the business of science to effect. We have no hesitation in saying that, for scientific precision of method and importance of results, Albert Durer, Da Vinci, and Hogarth—not to mention less noteworthy writers—must all yield the palm to Mr Hay. X. In oblong folio, 57 Plates and numerous Woodcuts, price 42s., AN ESSAY ON ORNAMENTAL DESIGN, IN WHICH ITS TRUE PRINCIPLES ARE DEVELOPED AND ELUCIDATED, &c. _From the Athenæum._ In conclusion, Mr Hay’s book goes forth with our best wishes. It must be good. It must be prolific of thought—stimulant of invention. It is to be acknowledged as a benefit of an unusual character conferred on the arts of ornamental design. _From the Spectator._ Mr Hay has studied the subject deeply and scientifically. In this treatise on ornamental design, the student will find a clue to the discovery of the source of an endless variety of beautiful forms and combinations of lines, in the application of certain fixed laws of harmonious proportion to the purposes of art. Mr Hay also exemplifies the application of his theory of linear harmony to the production of beautiful forms generally, testing its soundness by applying it to the human figure, and the purest creations of Greek art. _From Fraser’s Magazine._ Each part of this work is enriched by diagrams of great beauty, direct emanations of principle, and, consequently, presenting entirely new combinations of form. Had our space permitted, we should have made some extracts from this “Essay on Ornamental Design;” and we would have done so, because of the discriminating taste by which it is pervaded, and the forcible observations which it contains; but we cannot venture on the indulgence. XI. In 4to, 17 Plates and 38 Woodcuts, price 25s., PROPORTION, OR THE GEOMETRIC PRINCIPLE OF BEAUTY ANALYSED. XII. In 4to, 18 Plates and numerous Woodcuts, price 15s., THE NATURAL PRINCIPLES AND ANALOGY OF THE HARMONY OF FORM. _From the Edinburgh Review._ Notwithstanding some trivial points of difference between Mr Hay’s views and our own, we have derived the greatest pleasure from the perusal of these works. They are all composed with accuracy and even elegance. His opinions and views are distinctly brought before the reader, and stated with that modesty which characterises genius, and that firmness which indicates truth. _From Blackwood’s Magazine._