Communication by writing may be either single or private, or general and public; in the latter case plurality is attained through such methods as the affixing of bills and placards, or by means of transcripts or reproductions of the original copy. At first the latter are made in accordance with the ordinary methods of writing; and in slave-holding communities--Rome, for example--slaves who wrote to dictation were employed as scribes. The discovery of a method by which to obtain a plurality of copies through a single mechanical process was epoch-making. The printing-press has performed a far greater service to humanity than have most inventions; for, with the possibility of producing thousands of copies of a communication, the thoughts embodied in it become forces; they may enter the minds of many individuals who are either convinced or actually guided by them. Ideas become active through their suggestion on the masses of the population. This may lead to a one-sided rule of public opinion; but a healthy race will travel intellectually in many directions, and various beliefs supplement one another, struggle together, conquer, and are conquered. In this manner thoughts awaken popular movements, rousing a people to a hitherto unknown degree, and forcing men to think and to join issues. Thus the Press becomes a factor in civilisation of the very first importance. The necessity for periodic communication, together with curiosity that refuses to wait long for information, leads to the establishment of regularly recurrent publications; and thus, in addition to the book-press, the newspaper-press, that has learned how to hold great centres of population under its control, appears. Naturally this method of aiding the progress of civilisation has its disadvantages, as have all other methods; the conception of the world becomes superficial; individuality loses in character; not only a certain levelling of education, but also a levelling of views of life and of modes of thought, results. But, on the whole, knowledge is spread abroad as it never was before. [Illustration: EXAMPLES OF AZTEC HIEROGLYPHIC SCULPTURE AND WRITING The hieroglyphics and script of the Aztecs were independently developed. The first illustration is from a sculpture in Mexico, and the other is a small reproduction of a page of the Maya manuscript at Dresden. In both cases the symbolism is only imperfectly understood at present. ] Man, as a thinking being, craves for a conception of life; and in his inmost thoughts he seeks for an explanation of the double relationship of Man to Nature and of Nature to Man, striving to bring all into harmony. This he finds in religion. [Illustration: Frith THE GREAT BUDDHA AT KAMAKURA, IN JAPAN