To an unpractised eye the light relievos and fanciful arabesques which cover the walls of the Alhambra appear to have been sculptured by the hand, with a minute and patient labor, an inexhaustible variety of detail, yet a general uniformity and harmony of design truly astonishing; and this may especially be said of the vaults and cupolas, which are wrought like honey-combs, or frostwork, with stalactites and pendants which confound the beholder with the seeming intricacy of their patterns. The astonishment ceases, however, when it is discovered that this is all stucco-work: plates of plaster of Paris, cast in moulds and skilfully joined so as to form patterns of every size and form. This mode of diapering walls with arabesques and stuccoing the vaults with grotto-work, was invented in Damascus, but highly improved by the Moors in Morocco, to whom Saracenic architecture owes its most graceful and fanciful details. The process by which all this fairy tracery was produced was ingeniously simple: The wall in its naked state was divided off by lines crossing at right angles, such as artists use in copying a picture; over these were drawn a succession of intersecting segments of circles. By the aid of these the artists could work with celerity and certainty, and from the mere intersection of the plain and curved lines arose the interminable variety of patterns and the general uniformity of their character. Much gilding was used in the stucco-work, especially of the cupolas: and the interstices were delicately pencilled with brilliant colors, such as vermilion and lapis lazuli, laid on with the whites of eggs. The primitive colors alone were used, says Ford, by the Egyptians, Greeks, and Arabs, in the early period of art; and they prevail in the Alhambra whenever the artist has been Arabic or Moorish. It is remarkable how much of their original brilliancy remains after the lapse of several centuries. The lower part of the walls in the saloons, to the height of several feet, is incrusted with glazed tiles, joined like the plates of stucco-work, so as to form various patterns. On some of them are emblazoned the escutcheons of the Moslem kings, traversed with a band and motto. These glazed tiles (azulejos in Spanish, az-zulaj in Arabic) are of Oriental origin; their coolness, cleanliness, and freedom from vermin, render them admirably fitted in sultry climates for paving halls and fountains, incrusting bathing rooms, and lining the walls of chambers. Ford is inclined to give them great antiquity. From their prevailing colors, sapphire and blue, he deduces that they may have formed the kind of pavements alluded to in the sacred Scriptures —“There was under his feet as it were a paved work of a sapphire stone” (Exod. xxiv. 10); and again, “Behold I will lay thy stones with fair colors, and lay thy foundations with sapphires.” (Isaiah liv. 11.) These glazed or porcelain tiles were introduced into Spain at an early date by the Moslems. Some are to be seen among the Moorish ruins which have been there upwards of eight centuries. Manufactures of them still exist in the peninsula, and they are much used in the best Spanish houses, especially in the southern provinces, for paving and lining the summer apartments. The Spaniards introduced them into the Netherlands when they had possession of that country. The people of Holland adopted them with avidity, as wonderfully suited to their pa**ion for household cleanliness; and thus these Oriental inventions, the azulejos of the Spanish, the az-zulaj of the Arabs, have come to be commonly known as Dutch tiles.