v. 91;

definition of ideas of, i. 13, 20.

Infinity, typical of redeemed life, iv. 80; expressed in nature by curvature and gradation, ii. 45-48; of gradation, i. 210, 224, ii. 47; of variety in nature's coloring, i. 168, 172, 325, iv. 127; of nature's fulness, i. 195, v. 99; of clouds, i. 218, 235, v. 110, 113; of detail in mountains, i. 290, 297; of curvature, i. 315, ii. 60, iv. 262-269, v. 39; expressed by distance, ii. 41; not implied by vastness, ii. 49; the cause of mystery, iv. 58; of mountain vegetation, iv. 288; absence of, in Dutch work, v. 37; general delight in, ii. 42-44.

Inspiration, the expression of the mind of a God-made great man, iii. 141; expression of, on human form, ii. 214; as manifested in impious men, ii. 137, 138; revelations made by, how communicable, ii. 133; condition of prophetic, iii. 159.

Intellect, how affected by novelty, ii. 54; how connected with pleasure derived from art, i. 10, 28; its operation upon the features, ii. 113-115; connection of beauty with, i. 27; how influenced by state of heart, ii. 17, 114; affected by climatic influences, v. 134; how rendered weak, v. 205, 247; abuse of, v. 266 (note); culture of, in mechanical arts, v. 328 (note); comparison between Angelico's, Salvator's, Durer's, and Giorgione's,