style, which people sometimes praised, but with absolue re-assertion of the truth and value of its contents, which people always denied. As natural form is varied, so must beautiful ornament be varied. You are not an artist by reproving nature into deathful sameness, but by animating your copy of her into vital variation. But I thought at that time that only Goths were rightly changeful. I never thought Greeks were. Their reserved variation escaped me, or I thought it accidental. Here, however, is a coin of the finest Greek workmanship, which shows you their mind in this matter unmistakably. Here are the waves of the Adriatic 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 [Greek: *bostruchos*] 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 lecture on crockets only--to trace the succeeding changes through the curl of Richard II.'s hair, and the crisp leaves of the forests of Picardy, to the knobbed extravagances of expiring Gothic. But I must to-day let you compare one piece of perfect Gothic work with the perfect Greek. 174. There is no question in my own mind, and, I believe, none in that of any other long-practised student of mediæval art, that in pure structural Gothic the church of St. Urbain at Troyes is without rival in Europe. Here is a rude sketch of its use of the crocket in the spandrils of its external tracery, and here are the waves of the Greek sea round the son of Poseidon. Seventeen hundred years are between them, but the same mind is in both. I wonder how many times seventeen hundred years Mr. Darwin will ask, to retrace the Greek designer of this into his primitive ape; or how many times six hundred years of such improvements as we have made on the church of St. Urbain, will be needed in order to enable our descendants to regard the designers of that, as only primitive apes.