When employed upon a very large scale, their methods of composition shock the eye less than when applied to small subjects. We instinctively feel that even the ablest artist must sometimes have played fast and loose with the laws of perspective, if tasked to cover the enormous surfaces of Egyptian pylons. Hence the unities of the subject are never strictly observed in these enormous bas-reliefs. The main object being to perpetuate the memory of a victorious Pharaoh, that Pharaoh necessarily plays the leading part; but instead of selecting from among his striking deeds some one leading episode pre-eminently calculated to illustrate his greatness, the Egyptian artist delighted to present the successive incidents of his campaigns at a single coup d'oeil.
[2].--TECHNICAL PROCESSES.
The preparation of the surface about to be decorated demanded much time and care. Seeing how imperfect were the methods of construction, and how impossible it was for the architect to ensure a perfectly level surface for the facing stones of his temple-walls and pylons, the decorator had perforce to accommodate himself to a surface slightly rounded in some places and slightly hollowed in others. Even the blocks of which it was formed were scarcely homogeneous in texture. The limestone strata in which the Theban catacombs were excavated were almost always interspersed with flint nodules, fossils, and petrified shells. These faults were variously remedied according as the decoration was to be sculptured or painted. If painted, the wall was first roughly levelled, and then overlaid with a coat of black clay and chopped straw, similar to the mixture used for brick- making. If sculptured, then the artist had to arrange his subject so as to avoid the inequalities of the stone as much as possible. When these occurred in the midst of the figure subjects, and if they did not offer too stubborn a resistance to the chisel, they were simply worked over; otherwise the piece was cut out and a new piece fitted in, or the hole was filled up with white cement. This mending process was no trifling matter. We could point to tomb-chambers where every wall is thus inlaid to the extent of one quarter of its surface. The preliminary work being done, the whole was covered with a thin coat of fine plaster mixed with white of egg, which hid the mud-wash or the piecing, and prepared a level and polished surface for the pencil of the artist. In chambers, or parts of chambers, which have been left unfinished, and even in the quarries, we constantly find sketches of intended bas-reliefs, outlined in red or black ink. The copy was generally executed upon a small scale, then squared off, and transferred to the wall by the pupils and assistants of the master.
