The stone statues at Copan, for example, could not all have been done by the same artist, nor at the same time. I have elsewhere shown that two of these statues are absolutely identical. How was this accomplished? Was one stone taken to the foot of the other and cut by it as a pattern? This is unlikely, especially as in the case mentioned the _scale_ of the two statues is quite different. I think it far more likely that each was cut from a drawing, or series of drawings, which must have been preserved by priestly authority. The work at any one place must have required many years, and could not have been done by a single man; nor is it probable that it was all done in one generation. Separate hieroglyphs must have been preserved in the same way. It is this rigid adherence to a type, and the banishment of artistic fancy, which will allow of progress in the deciphering of the inscriptions or the comparison of the statues. Line after line, ornament after ornament, is repeated with utter fidelity. The reason of this is not far to seek. This, however, is not the place to explain it, but rather to take advantage of the fact itself. We may fairly say that were it not so, and with our present data, all advances would be tenfold more difficult. III. SYSTEM OF NOMENCLATURE. It is impossible without a special and expensive font of type to refer pictorially to each character, and therefore some system of nomenclature must be adopted. The one I employ I could now slightly improve, but it has been used and results have been obtained by it. It is sufficient for the purpose, and I will, therefore, retain it rather than to run the risk of errors by changing it to a more perfect system. I have numbered the plates in STEPHENS'S _Central America_ according to the following scheme: ENGRAVINGS OF VOLUME I.