In fact appearance, outward show, observance of the "eleventh commandment," in a word "face" as it is called, is everything in China. "To understand, however imperfectly, what is meant by 'face,' we must take account of the fact that as a race the Chinese have a strong dramatic instinct. Upon very slight provocation any Chinese regards himself in the light of an actor in a drama. A Chinese thinks in theatrical terms. If his troubles are adjusted he speaks of himself as having 'got off the stage' with credit, and if they are not adjusted he finds no way to 'retire from the stage.' The question is never of facts, but always of form. Once rightly apprehended, 'face' will be found to be in itself a key to the combination-lock of many of the most important characteristics of the Chinese[487]." Of foreign religions Islam, next to Buddhism, has made most progress. Introduced by the early Arab and Persian traders, and zealously preached throughout the Jagatai empire in the twelfth century, it has secured a firm footing especially in Kan-su, Shen-si, and Yunnan, and is of course dominant in Eastern (Chinese) Turkestan. Despite the wholesale butcheries that followed the repeated insurrections between 1855 and 1877, the _Hoei-Hoei_, _Panthays_, or _Dungans_, as the Muhammadans are variously called, were still estimated, in 1898, at about 22,000,000 in the whole empire. Islam was preceded by Christianity, which, as attested by the authentic inscription of Si-ngan-fu, penetrated into the western provinces under the form of Nestorianism about the seventh century. The famous Roman Catholic missions with headquarters at Pekin date from the close of the sixteenth century, and despite internal dissensions have had a fair measure of success, the congregations comprising altogether over one million members. Protestant missions date from 1807 (London Missionary Society) and in 1910 claimed over 200,000 church members and baptized Christians, the total having more than doubled since 1900[488]. The above-mentioned dissensions arose out of the practices associated with ancestry worship, offerings of flowers, fruits and so forth, which the Jesuits regarded merely as proofs of filial devotion, but were denounced by the Dominicans as acts of idolatry. After many years of idle controversy, the question was at last decided against the Jesuits by Clement XI in the famous Bull, _Ex illa die_ (1715), and since then, neophytes having to renounce the national cult of their forefathers, conversions have mainly been confined to the lower classes, too humble to boast of any family tree, or too poor to commemorate the dead by ever-recurring costly sepulchral rites.