LIST OF ILLUSTRATIONS. xi NO. PAGE 49. Scales tx.rned about to make a flowing dlper . 34 50. Showing relation of scale to diamond, ogee, and hexagon 55 51. Wave lines, ogee diaper, and interlacing ogees — THE last giving HEXAGONAL SHAPES ■ . ■ • 3,5 52. Diapers constructed on circular lines — Gothic tracery 3'3 53. A DIAPER and its CONSTRUCTIONAL LINES GOTHIC TRACERY 3';> 54. Tracery pattern and its constructional lines — Gothic 37 55. Diaper and its constructional lines — Gothic tracery 3S 56. Straight-lined and curvilinear versions of diaper built on the same lines as 6l 4o 57-62. Diagrams showing the various ways in which THE same diaper MIGHT POSSIBLY BE CONSTRUCTED .4I-44 63. counterchange diaper and its construction Alhambresque tile mosaic 45 64. Lattice pattern — Arab woodwork 45 65. Diagram showing construction of 64 . . . . 46 66. Diagram explaining the composition of the unit in patterns 64 and 65 46 67. CoUNTERCHANGE PATTERNS CONSTRUCTED AS 66 ARAB . 47 68. Key to the construction of 69 47 69. Roman mosaic pavement pattern 48 70. Counterchange pattern — Alhambresque tile mosaic . 49 71. Lattice pattern, possibly derived from tessel.ted work — Arab woodwork 50 72. 73. Lines on which lattice 71 might have been built 51 74. Lattice and the lines of its construction — Arab woodwork 52 75. Lattice and its construction — Arab woodwork . . 53 76. Curvilinear development of diagram 26 . . . ^5 77. Diagram showing the relation of equilateral triangles and hex.gons to square repeat . . 56
