#2 Egyptian Idea Of One.

The Egyptian idea of a pyramid was that of a structure on a square base, with four inclining sides, each one of which should be an equilateral triangle, all meeting in a point at the top. The structure might be solid, and in that case might be either of hewn stone throughout, or consist of a mass of rubble merely held together by an external casing of stone; or it might contain chambers and passages, in which case the employment of rubble was scarcely possible. It has been demonstrated by actual excavation, that all the great pyramids of Egypt were of the latter character that they were built for the express purpose of containing chambers and passages, and of preserving those chambers and passages intact. They required, therefore, to be, and in most cases are, of a good construction throughout.