In 1741 the population was estimated by Père Amiot, S.J., at over one hundred and fifty millions, as against twenty-one million households in 1701. In 1753 there was trouble in Ili. After the death of Galdan II., son of Arabtan, an attempt was made by one, Amursana, to usurp the principality. He was, however, driven out, and fled to Peking, where he was favourably received by Ch'ien Lung, and an army was sent to reinstate him. With the subsequent settlement, under which he was to have only one quarter of Ili, Amursana was profoundly dissatisfied, and took the earliest opportunity of turning on his benefactors. He murdered the Manchu-Chinese garrison and all the other Chinese he could find, and proclaimed himself khan of the Eleuths. His triumph was short-lived; another army was sent from Peking, this time against him, and he fled into Russian territory, dying there soon afterwards of smallpox. This campaign was lavishly illustrated by Chinese artists, who produced a series of realistic pictures of the battles and skirmishes fought by Ch'ien Lung's victorious troops. How far these were prepared under the guidance of the Jesuit Fathers does not seem to be known. About sixty years previously, under the reign of K'ang Hsi, the Jesuits had carried out extensive surveys, and had drawn fairly accurate maps of Chinese territory, which had been sent to Paris and there engraved on copper by order of Louis XIV. In like manner, the pictures now in question were forwarded to Paris and engraved, between 1769 and 1774, by skilled draughtsmen, as may be gathered from the lettering at the foot of each; for instance--_Gravé par J. P. Le Bas, graveur du cabinet du roi_ (Cambridge University Library). Kuldja and Kashgaria were next added to the empire, and Manchu supremacy was established in Tibet. Burma and Nepal were forced to pay tribute, after a disastrous war (1766-1770) with the former country, in which a Chinese army had been almost exterminated; rebellions in Ss[)u]ch'uan (1770), Shantung (1777), and Formosa (1786) were suppressed.