tment of borders in, f127;
white outline in, 260.

Persian ornament, typical, 212, f116.

Persian rugs, value of different quantities in, 98-101.

Perugino, National Gallery triptych, f140.

Photograph, influence of the, 55, 56;
principle of the, 187, 190.

Picture writing, 27, f019.

Pinturicchio, frescoes in the Sistine Chapel, 226;
mural painting at Siena, 226, f120;
frescoes in the Appartimenti Borgia, 238, f125.

Pisano, Vittore, medals of, 198, f110.

Poppy, horned study of, f022;
adaptation of for needlework, f023;
sketch of on different coloured grounds, f132, 258.

Prints, principles of design for, 246-251.

Procession, lines of movement in a, 160, 162-163.

Pyramid, the, 73;
use of in architecture, f045b, f048a.

Radiating principle of line, the, 46-50.

Raphael, study of drapery by, f102.

Ravenna, S. Vitale, sketch of apse, f070.

Recurring line and form, f031, f032;
value of in architecture, 119, 124.

Relief, methods of expressing, 165;
use of contrast, 166;
decorative relief, 171;
on diapered ground, 174-175;
by simple linear contrasts, 174, 176-178;
by linear shading, 176, 178;
by diagonal shading, 176, 178-180;
value of emphasis in, 180;
by light and shade alone, 187-190;
principle of in architectural mouldings, 190;
modelled, 192;
in sculpture, 192-199, f109;
Florentine fifteenth-century work, 202;
natural principle of, 204, f111b;
by colour, 256, 258.

Repeating patterns, 36, f026, f077b, f078;
method of testing, 38, f028.

Rhythm of design, the, 32.

Roofs, German, 146-148.

Rothenburg, roof-lines in, f085.

St. David's Cathedral, carvings in, 122-124;
Gothic tile pattern in, f074, f076.

Scale, importance of in mural decoration, 230, 232.

Sculpture, relief in, 192;
Egyptian, 192, 194;
Grecian, 194, f107, 197;
Gothics, 197;
on mediaeval tombs, 198.

Selection, the test of artistic treatment, 214.

Shields, F. J., mural decoration, 228.

Silhouette, 2, f010a.

Skirting, the, 234.

Spaces, decorative, in design, 113;
apparent depth or width increased by use of vertical or horizontal
lines, 232, f122.

Spacing, mural, 230, f121, f123.

Sphere, the, 73;
use of in architecture, f045b, f048a;
in nature, 76.

Stained glass, principles of design for, 252, 255.

Surfaces, linear expression of, 18.

Tapestry, 237;
Burgundian, 237, f124;
effect of texture on colour in, 24