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148 round a knight of Tarentum, and there is no doubt of their variableness.

172. This pattern of sea-wave, or river whirlpool, entirely sacred in the Greek mind, and the or similarly curling wave in flowing hair, are the two main sources of the spiral form in lambent or rampant decoration. Of such lambent ornament, the most important piece is the crocket, of which I rapidly set before you the origin.

173. Here is a drawing of the gable of the bishop's throne in the upper church at Assisi, of the exact period when the mosaic workers of the thirteenth century at Rome adopted rudely the masonry of the north. Briefly, this is a Greek temple pediment, in which, doubtful of their power to carve figures beautiful enough, they cut a trefoiled hold for ornament, and bordered the edges with harlequinade of mosaic. They then call to their help the Greek sea-waves, and let the surf of the Ægean climb along the slopes, and toss itself at the top into a fleur-de-lys. Every wave is varied in outline and proportionate distance, though cut with a precision of curve like that of the sea itself. From this root we are able—but it must be in a