Durandus next devotes a whole chapter to the symbolism of the altar, and another to the significance and function of ornaments, pictures, and sculpture. The latter opens with the words: “The pictures and ornaments in a church are the texts and scriptures (_lectiones et scripturae_) of the laity.” This chapter is long; it explains how Christ and the angels, also saints, Apostles and others, should be represented, and describes the proper kinds of church ornament and utensils. Much of the detail is symbolical. Thus Durandus devised or brought together meanings to fit each bit of the church edifice, its materials and furnishings. In the work of a contemporary are stored the allegorical meanings of the subjects of Gothic sculpture and painted glass. The thirteenth century had a weakness for the word “Speculum,” and the idea it carried of a mirror or compendium of all human knowledge. The chief of mediaeval encyclopaedists was Vincent of Beauvais, a _protégé_ of the saintly King Louis IX. An analysis of his huge _Speculum majus_ is given elsewhere.[90] It was made up of the Mirror of Nature, the Mirror of human Knowledge and Ethics, and the Mirror of History. The compiler and his assistants laboured during the best period of Gothic art, and from their work, industry may draw an exhaustive commentary upon the series of topics presented by the sculpture and glass of a cathedral.[91] The Mirror of Nature appears carved in the sculpture of Chartres or Bourges. In rendering the work of the Six Days, the Creator is shown (under the form of Christ)[92] contemplating His work, or resting from His toil; here and there a lion, sheep, or goat, suggests the animal creation, and a few trees the vegetable world. This is the necessary symbolism of the sculptor’s art. But Gothic animals and plants sometimes have other definite symbolic meanings, as in the instance of the well-known signs of the four Evangelists, the man, the lion, the ox, the eagle. The allegorical interpretations of Scripture were an exhaustless source of symbolism for Gothic sculptors; another was the _Physiologus_ and its progeny of Bestiaries, with their symbolic explanations of the legendary attributes of animals. Intentional symbolism, however, did not inhere in all this carving, much of which is sheer fancy and decoration. Such was the character of the splendid Gothic flora, of the birds and beasts that move in it, and of the grotesque monsters. They were not out of place, since the Gothic cathedral was itself a Speculum or Summa, and should include the whole of God’s creation, not omitting even the devils who beset men’s souls.