Man's first desire is long life; his second, to be rich. The Taoist philosophy commenced with the former before the Christian era, but it was not long in finding its way to the latter. A powerful impulse was thus given to research in the three departments of science,--chemistry, botany, and geography. As in the case of gunpowder, the Arabs transmitted these discoveries to the West, and along with them the Chinese doctrine as to the twofold objects of alchemic studies,--the elixir of life and the philosopher's stone. From this double root sprang the chemistry of the West, which in no mean sense has fulfilled its promise by prolonging life and enriching mankind. In all these the West has performed the part of a nursing mother, but she has brought the nursling back full grown, and prepared to repay its obligation to its true parent by effective service. Portuguese merchants made their way to Canton early in the sixteenth century, but it was not till the latter part of the century that Catholic missionaries entered on their grand crusade. In 1601 the Jesuit pioneer Matteo Ricci and his associates, impelled by religion and armed with science, presented themselves at the court of Peking. The Chinese had been able to reckon the length of the year with remarkable accuracy two thousand years before the time of Christ, but their science had made no headway. The missionaries found their calendar in a state of confusion, vanquished the native astronomers in fair competition, and were formally installed as keepers of the Imperial Observatory; and these missionaries supervised the casting of the bronze instruments which have since been taken to Berlin. This honor they retained even after the fall of the native dynasty that patronized them. When the Manchus effected their conquest in 1644, not only were the Jesuit missionaries left in charge of the observatory, but the heir apparent was placed under their instruction. Coming to the throne in 1662, under the now illustrious title of _Kanghi_, the young prince showed himself a generous patron as he had previously been a respectful pupil. He was apparently not averse to the idea of his people's adopting Christianity as their national religion, and allowed the missionaries a free hand to plant churches throughout the vast interior. Rarely if ever has so fine an opportunity offered for making an easy conquest of a pagan empire. It was lost through the jealousy of contending societies, and especially through the blunder of an infallible Pope. The Dominicans denounced the Jesuits for tolerating the practice of pagan rites, such as the worship of ancestors, and for employing for God the name of a pagan deity. The name which they then objected to was Shang-ti, Supreme Ruler, a venerable designation for the Supreme Power found in the earliest of the Chinese canonical books, and at this day accepted by a large proportion of Protestant missionaries.