WILLIAM BLACKWOOD AND SONS. 19 



WORKS BY D. R. HAY. 



FIRST PRINCIPLES OF SYMMETRICAL BEAUTY. 



In Small Octavo. With One Hundred Illustrative Plates. Price 6s. 



THE PRINCIPLES OF BEAUTY IN COLOURING 

 SYSTEMATISED. 



In One Volume, with Coloured Examples. 

 Elegantly hound in cloth, price 21s. 



III. 



A NOMENCLATURE OF COLOURS, HUES, TINTS, 



AND SHADES. 



With Coloured Examples, Second Edition, price 353. 



IT. 



AN ESSAY ON ORNAMENTAL DESIGN, 



IN WHICH ITS TRUE PRINCIPLES ARE DEVELOPED 



AND ELUCIDATED, &c. &c. 



Oblong FoUo. 57 Plates and Numerous Woodcuts. Price jE2, 2s. 



PROPORTION, OR THE GEOMETRIC PRINCIPLE OF 

 BEAUTY, ANALYSED. 



Quarto. 17 Plates and 38 Woodcuts. Price 25s. 



TI. 



THE NATURAL PRINCIPLES AND ANALOGY OF 

 THE HARMONY OF FORM. 



Quarto. 18 Plates and numerous Woodcuts. Price 15s. 



THE LAWS OF HARMONIOUS COLOURING 

 ADAPTED TO INTERIOR DECORAI iOiNS. 



Sixth Edition. 

 Crown Octavo. Price 6a. 6d. 



