Under the first passion of this enthusiasm Pompeii was transformed. Almost all the public buildings received their present shape from this wave of pure Greek art. Almost every one is graceful and lovely, the columns and architraves were white, the ornament not overloaded, the decorations simple. The artists who tinted the walls confined themselves to producing masses of colour. Wall pictures there were none; but the mosaics of the floors were wrought with curious beauty, and reproduced the first compositions of great painters. The House of the Faun is beautified by no wall pictures, but it contained on the floor of the room which divided the two peristyles one of the finest mosaics ever found, that which depicts the battle of Alexander the Great upon the Issos. The stream of Greek influence ran pure for some four generations. After that it was contaminated. Man can keep no beauty in his hands for long unspoilt. The change is manifest in Pompeii. The Roman influence stole in. A muddy taste obscured the simple grace of the Greek lines, tortured the architecture, piled up unmeaning ornament, and degraded all the city. There were many stages between the first step and the last, not a few still beautiful, though the downward tendency is plain. The house of the Vettii is the finest of the later period. There one may see wall-paintings of rare charm, mingled with others of far inferior taste, as if the gallery of some fine connoisseur had fallen by mischance into the hands of men who did not understand its worth, and placed the compositions of degraded artists side by side with the masterpieces of an olden time. Exact descriptions of these houses are the business of the guide-book. But there are certain observations which I think it necessary to make about the paintings--though if anyone would read the work of Helbig on the subject, it would be much better.