Herodotus states (ii. § 36) that the hieratic (priests) and the demotic (common) were the two written languages of Egypt,--these two were apart from the hieroglyphical or _symbolical_ language. Diodorus Siculus (iii., § 3) supports his predecessor, and says that the former (hieratic) was used _only by the priests_,--while the latter (_i. e._ the Enchorial or demotic) was used in common by all the Egyptians,--_i. e._, that it was the _spoken_ language of the country, and, as already shewn, not used upon _sacred_ edifices. From these facts, derived from ancient custom, may be gathered why the ciphers of the common language of the Mexican Aborigines are not found upon _their_ Temples; and as a consequence, the absence of the spoken language upon those Temples proves them (from the ancient custom) to have been erected at a period when that peculiar custom was practised; and therefore, (apart from other considerations) the time of their erection must be viewed at a remote antiquity. "It (the stucco) was painted, and in different places about we discovered the remains of _red_, _blue_, _yellow_, black, and white." In the language of the Fine Arts "black and white" are not received as colours--they are merely accessories. Red, Blue, and Yellow, are the three; and the only primitive earth-colours, and by their amalgamation in certain proportions (aided by the subordinates, black and white) all secondary colours--or _tints_ strictly speaking--are produced. The Rainbow possesses but _three_ primitive colours; but by their juxtaposition and refractions, the purple, orange, green, and violet are produced. Titian painted a picture in which he used only the three primitives; but taking the Rainbow for his mistress in colouring, he so arranged the juxtapositions of the original and "divine three," that the cloud-created Iris might well be jealous of the triple tints of Titian! No greater proof could be given of antiquity, than the discovery that the Mexican Aborigines were ignorant of the art of mixing colours--for the three primitives only, and not the secondary colours--are found upon the Temples. The "Tyrian dye" or purple, was not extracted from the earth, but from the Sea, from a shell-fish, since called the _purple murex_. For ages it was believed that the Rainbow possessed _seven_ colours. Science has proved that it contains but _three_. Nature has no more: and without even alluding to other religious opinions--the Trinity is even figured in the Rainbow: and the Divine Arch viewed in this figurative manner, has indeed the Eye of the Almighty upon it--_the Three in One_--it is not only the "Covenant," but the Type of Salvation from the Father to his children!