The building is Aladdin’s cave, and the glass a myriad jewels set in lead lines and in tracery of stone! But metaphors are unavailing, epithets are quite powerless to convey the beauty of the light which pours through them. It is as marvellous, and it changes as unceasingly as the ever-changing hues of a sunset on the western shores of Scotland, or on the iridescent waters of the Venetian lagoons. And it is even more brilliant than these. When the noonday sun is darting his angry rays across the aisles, or soft rain-laden beams streak the spaces with stripes of bloom; when the shades of evening have begun to fall, or when the dawn is gathering strength, and is now lighting the dim distances of the vast nave, you may sit and gaze round on those windows. You watch the wine-red, the blood-red, the yellow and the brown of the Rose of France and the lancet lights beneath, till the memory of all other beauty upon earth fades in the intoxication of that stupendous colouring. You turn at last, and, since no memory, however vivid, can retain to the full the impression of the beauty of that glass, you are startled into another ecstasy. For you have forgotten that there can be other windows as beautiful. You cannot believe that there are other colours as exquisite, until you see once more those blues and greens, ultramarines and peacock blues and azures, and those fiery reds which shine in upon the astonished sight from the windows of the south transept and the aisles. And still there remain the lights of the choir and the apse, and still the old glories, ever new, of the azure of the western lancets, the sapphires and rubies of the western rose. The reds, like those at Reims, are everywhere wonderful; the saffron also and the citron yellows, the brown and the emerald green; but most superbly beautiful of all are the blues, the lucid transparent azure of the twelfth-century lancets, and the deep sapphire, the blue of Poitiers, which fills the lower windows of the nave. The secret of its manufacture is lost, but you can understand, when you behold it, how easily that story was believed which said that in order to secure this depth of blue the monkish glaziers used to grind sapphires to powder and mix them with their glass. There is only one thing that can be compared with the stained glass of the North, and that is the mosaics of the South, of Ravenna, Palermo, San Sofia. You ‘gaze round on those windows, the pride of France,’ and as you feast your eyes upon the sparkling azure and the blood-red rays that stream from the rose, you understand also how easily the lad who saw it for the first time was led to say, when suddenly above him the organ burst forth into music, that it seemed to him as if the window spoke!