Let us now take in all that has here been stated, at one glance, and we shall see clearly why Persian ceramic art has been viewed with doubt. Overrun successively by Greeks, Parthians, Arabs, Moguls, and Turks; widening and contracting its boundaries as the tide of conquest ebbed and flowed; lending to India, and probably borrowing from it; taking part, at one time, in the Zoroastrian worship of fire, and, at another, in the Mohammedan praise of Allah; connected, through trade, with the far East on the one hand and with Europe on the other, Persia was pre-eminently a country to confuse the investigator by the mingled types, symbols, and ideas which it derived alike from conqueror and trader. One fact of peculiar interest remains to be added. When, in the middle of the thirteenth century, Hulaku Khan came to Persia, he brought among his Mogul followers a number of Chinese artisans. The Mogul territory touched the western boundaries of China, so that it is quite possible, that to the specimens of Chinese porcelain brought to Persia by sea may have been added a number of Chinese artists and potters arriving with the Moguls by land. In view of these facts it is not difficult to account for the prevalence in Persia of imitations of the Chinese, nor is it altogether incomprehensible that a question should have been raised whether what is called Persian porcelain is not in reality Chinese. [Illustration: Fig. 140.--Persian Plaque. Crimson Pæony in Centre; Foliage and Ground in various Shades of Green. (Boston Museum of Fine Arts.)] Persian decoration is rich in flowers (Fig. 140), for which that people entertained a liking amounting almost to a passion. The tulip meant love. Of the other symbolical forms found on pottery, the lion and bull and the cypress have already been explained. The sun was the Zoroastrian emblem of divinity, and the royal arms consisted of the lion couchant, with its head turned toward the rising sun. [Illustration: Fig. 141.--Persian Plaque. Central Section, Blue; Side Section, Green; Scroll-work, Brown. (Boston Museum of Fine Arts.)]