One thing which might surprise us in casting an eye over the foregoing representations as a whole is the small progress made considering the immensely long period covered by the glimpses we have of the music of this far-away race. From the days of the harpers in our earliest illustrations to those of the last is more than 2,000 years, in fact considerably longer than from the beginning of the Christian era until now. The explanation is easy to find. In the first place, the incitations upon the side of sense perception were comparatively meager. Neither in sonority nor in delicacy of tonal resource were the Egyptian instruments a tenth part as stimulating as those of to-day. Moreover, we have here to deal with childlike intelligences, slow perceptions, and limited opportunities of comparison. Hence if these were all the discouraging elements there would be but little cause for wonder at the slow progress. But there was another element deeper and more powerful. The Egyptian mind was conservative to reaction. Plato in his "Laws," says: "Long ago the Egyptians appear to have recognized the very principle of which we are now speaking--that their young citizens must be habituated to the forms and strains of virtue. These they fixed, and exhibited the patterns of them in their temples, and no painter or artist is allowed to innovate upon them, or to leave the traditional forms or invent new ones. To this day no alteration is allowed in these arts nor in music at all. And you will find that their works of art are painted or modeled in the same forms that they were 10,000 years ago. This is literally true, and no exaggeration--their ancient paintings and sculptures are not a whit better or worse than those of to-day, but are with just the same skill." This, which Dr. Draper calls the "protective idea," was undoubtedly the cause of their little progress.