At least three other systems of picture-writing in elaborated forms are recognised, namely, that used by the Hittites in Western Asia, that of the Chinese, and that of the Mexican Indians in America. No dates can be fixed as to when these were introduced, neither is it possible to demonstrate the entire independence of the various systems; but all of them were developed in prehistoric periods. There seems no reason to doubt that in each case the picture-writing consisted originally of the mere graphic presentation of an object as representing an idea connected with that object itself, precisely as if the Scythians had drawn pictures of the mouse, the bird, the frog, and the arrows in order to convey the message to Darius. Doubtless periods of incalculable length elapsed after the use of such ideograms as this had come into vogue before the next great step was taken, which consisted in using a picture, not merely to represent some idea associated with the object depicted, but to represent a sound. Probably the first steps of this development came about through the attempt to depict the names of men. Since the name of a man is often a combination of syllables, having no independent significance, it was obviously difficult to represent that name in a picture record, and yet, in the nature of the case, the name of the man might often constitute the most important part of the record. Sooner or later the difficulty was met, as the Egyptian hieroglyphics prove to us, by adopting a system of phonetics, in which a certain picture stands for the sound of each syllable of the name. The pictures selected for such syllabic use were usually chosen because the name of the object presented by the picture began with the sound in question. Such a syllabary having been introduced, its obvious utility led presently to its application, not merely to the spelling of proper names, but to general purposes of writing. One other step remained, namely, to make that final analysis of sounds which reduces the multitude of syllables to about twenty-five elementary sounds, and to recognise that, by supplying a symbol for each one of these sounds, the entire cumbersome structure of ideographs and syllables might be dispensed with. The Egyptians made this analysis before the dawn of history, and had provided themselves with an alphabet; but strangely enough they had not given up, nor did they ever relinquish in subsequent times, the system of ideographs and syllabics that mark the stages of evolution of the alphabet. The Babylonians at the beginning of their historic period had developed a most elaborate system of syllables, but their writing had not reached the alphabet stage.