APORRHETA (Greek αποῤῥέτα). The holy things in the ancient Mysteries which were known only to the initiates, and were not to be disclosed to the profane, were called the _aporrheta_. What are the aporrheta of Freemasonry? what are the arcana of which there can be no disclosure? is a question that for some years past has given rise to much discussion among the disciples of the institution. If the sphere and number of these aporrheta be very considerably extended, it is evident that much valuable investigation by public discussion of the science of Masonry will be prohibited. On the other hand, if the aporrheta are restricted to only a few points, much of the beauty, the permanency, and the efficacy of Freemasonry, which are dependent on its organization as a secret and mystical association, will be lost. We move between Scylla and Charybdis, and it is difficult for a masonic writer to know how to steer so as, in avoiding too frank an exposition of the principles of the Order, not to fall by too much reticence into obscurity. The European Masons are far more liberal in their views of the obligation of secrecy than the English or the American. There are few things, indeed, which a French or German masonic writer will refuse to discuss with the utmost frankness. It is now beginning to be very generally admitted, and English and American writers are acting on the admission, that the only real aporrheta of Freemasonry are the modes of recognition, and the peculiar and distinctive ceremonies of the Order; and to these last it is claimed that reference may be publicly made for the purposes of scientific investigation, provided that the reference be so made as to be obscure to the profane, and intelligible only to the initiated. APRON. The lambskin, or white leather apron, is the peculiar and distinctive badge of a mason. Its color must be white, and its material a lambskin. It is a symbol of purity, and it derives this symbolism from its color, white being symbolic of purity; from its material, the lamb having the same symbolic character; and from its use, which is to preserve the garments clean. The apron, or abnet, worn by the Egyptian and the Hebrew priests, and which has been considered as the analogue of the masonic apron, is supposed to have been a symbol of authority; but the use of the apron in Freemasonry originally as an implement of labor, is an evidence of the derivation of the speculative science from an operative art.