Nearly all the remains of American plastic art, sculpture, and painting, were obviously designed for religious purposes. Idols of stone, wood, or baked clay, were found in every Indian tribe, without exception, so far as I can judge; and in only a few directions do these arts seem to have been applied to secular purposes. The most ambitious attempts of architecture, it is plain, were inspired by religious fervor. The great pyramid of Cholula, the enormous mounds of the Mississippi valley, the elaborate edifices on artificial hills in Yucatan, were miniature representations of the mountains hallowed by tradition, the "Hill of Heaven," the peak on which their ancestors escaped in the flood, or that in the terrestrial paradise from which flow the rains. Their construction took men away from war and the chase, encouraged agriculture, peace, and a settled disposition, and fostered the love of property, of country, and of the gods. The priests were also close observers of nature, and were the first to discover its simpler laws. The Aztec sages were as devoted star-gazers as the Chaldeans, and their calendar bears unmistakable marks of native growth, and of its original purpose to fix the annual festivals. Writing by means of pictures and symbols was cultivated chiefly for religious ends, and the word _hieroglyph_ is a witness that the phonetic alphabet was discovered under the stimulus of the religious sentiment. Most of the aboriginal literature was composed and taught by the priests, and most of it refers to matters connected with their superstitions. As the gifts of votaries and the erection of temples enriched the sacerdotal order individually and collectively, the terrors of religion were lent to the secular arm to enforce the rights of property. Music, poetic, scenic, and historical recitations, formed parts of the ceremonies of the more civilized nations, and national unity was strengthened by a common shrine. An active barter in amulets, lucky stones, and charms, existed all over the continent, to a much greater extent than we might think. As experience demonstrates that nothing so efficiently promotes civilization as the free and peaceful intercourse of man with man, I lay particular stress on the common custom of making pilgrimages.