It would be tedious even to enumerate all the various literary undertakings conceived and carried out under the direction of K'ang Hsi; but there are two works in particular which cannot be passed over. One of these is the huge illustrated encyclopædia in which everything which has ever been said upon each of a vast array of subjects is brought into a systematized book of reference, running to many hundred volumes, and being almost a complete library in itself. It was printed, after the death of K'ang Hsi, from movable copper types. The other is, if anything, a still more extraordinary though not such a voluminous work. It is a concordance to all literature; not of words, but of phrases. A student meeting with an unfamiliar combination of characters can turn to its pages and find every passage given, in sufficient fullness, where the phrase in question has been used by poet, historian, or essayist. The last years of K'ang Hsi were beclouded by family troubles. For some kind of intrigue, in which magic played a prominent part, he had been compelled to degrade the Heir Apparent, and to appoint another son to the vacant post; but a year or two later, this son was found to be mentally deranged, and was placed under restraint. So things went on for several more years, the Emperor apparently unable to make up his mind as to the choice of a successor; and it was not until the last day of his life that he finally decided in favour of his fourth son. Dying in 1723, his reign had already extended beyond the Chinese cycle of sixty years, a feat which no Emperor of China, in historical times, had ever before achieved, but which was again to be accomplished, before the century was out, by his grandson. CHAPTER V YUNG CHÊNG AND CH'IEN LUNG The fourth son of K'ang Hsi came to the throne under the year-title of Yung Chêng (harmonious rectitude). He was confronted with serious difficulties from the very first. Dissatisfaction prevailed among his numerous brothers, at least one of whom may have felt that he had a better claim to rule than his junior in the family. This feeling culminated in a plot to dethrone Yung Chêng, which was, however, discovered in time, and resulted only in the degradation of the guilty brothers. The fact that among his opponents were native Christians--some say that the Jesuits were at the bottom of all the mischief--naturally influenced the Emperor against Christianity; no fewer than three hundred churches were destroyed, and all Catholic missionaries were thenceforward obliged to live either at Peking or at Macao. In 1732 he thought of expelling them altogether; but finding that they were enthusiastic teachers of filial piety, he left them alone, merely prohibiting fresh recruits from coming to China.