There are two modes essentially distinct from each other, by which ideas may be communicated through the medium of inscriptions addressed to the eye. These two modes are, first, by _symbolical_, and secondly, by _phonetic_ characters. Each of these two systems assumes, in fact, within itself, quite a variety of distinct forms, though it is only the general characteristics which distinguish the two great classes from each other, that we shall have occasion particularly to notice here. [Illustration: SYMBOLICAL WRITING] Symbolical writing consists of characters intended severally to denote _ideas_ or _things_, and not words. A good example of true symbolical writing is to be found in a certain figure often employed among the architectural decorations of churches, as an emblem of the Deity. It consists of a triangle representing the Trinity with the figure of an eye in the middle of it. The eye is intended to denote the divine omniscience. Such a character as this, is obviously the symbol of an idea, not the representative of a word. It may be read Jehovah, or God, or the Deity, or by any other word or phrase by which men are accustomed to denote the Supreme Being. It represents, in fine, the idea, and not any particular word by which the idea is expressed. The first attempts of men to preserve records of facts by means of inscriptions, have, in all ages, and among all nations, been of this character. At first, the inscriptions so made were strictly pictures, in which the whole scene intended to be commemorated was represented, in rude carvings. In process of time substitutions and abridgments were adopted in lieu of full representations, and these grew at length into a system of hieroglyphical characters, some natural, and others more or less arbitrary, but all denoting _ideas_ or _things_, and not the sounds of words. These characters are of the kind usually understood by the word hieroglyphics; though that word can not now with strict accuracy be applied as a distinctive appellation, since it has been ascertained in modern times that a large portion of the Egyptian hieroglyphics are of such a nature as brings them within the second of the two classes which we are here describing, that is, the several delineations represent the sounds and syllables of words, instead of being symbols of ideas or things. It happened that in some cases in this species of writing, as used in ancient times, the characters which were employed presented in their form some natural resemblance to the thing signified, and in other cases they were wholly arbitrary. Thus, the figure of a scepter denoted a king, that of a lion, strength; and two warriors, one with a shield, and the other advancing toward the first with a bow and arrow, represented a battle. We use in fact a symbol similar to the last-mentioned one at the present day, upon maps, where we often see a character formed by two swords crossed, employed to represent a battle.