The division of the whole course of lectures into three parts was originally suggested by the periodical succession in which the appointed hours recur, but it appears to be more convenient than any other for the regular classification of the subjects. The general doctrines of motion and their application to all purposes, variable at pleasure, supply the materials of the first two parts, of which the one treats of the motions of solid bodies and the other of those of fluids, including the theory of light. The third part relates to the particular history of the phenomena of nature, and of the affections of bodies actually existing in the universe independently of the art of man, comprehending astronomy, geography, and the doctrine of the properties of matter, and of the most general and powerful agents that influence it. The synthetical order of proceeding from simple and general principles to their more intimate combinations in particular cases, is by far the most compendious for conveying information with regard to sciences that are at all referable to certain fundamental laws. For these laws being once established, each fact, as soon as it is known, assumes its place in the system, and is retained in the memory by its relation to the rest as a connecting link. In the analytical mode, on the contrary, which is absolutely necessary for the first investigation of truth, we are obliged to begin by collecting a number of insulated circumstances, which lead us back by degrees to the knowledge of original principles, but which, until we arrive at these principles, are merely a burden to the memory. For the phenomena of nature resemble the scattered leaves of the Sibylline prophecies; a word only, or a single syllable, is written on each leaf, which, when separately considered, conveys no instruction to the mind, but when, by the labour of patient investigation, every fragment is replaced in its appropriate connexion, the whole begins at once to speak a perspicuous and a harmonious language. On July 5 he requested leave of the managers to be absent during the months of August and September, taking care in the meantime to provide sufficient matter for the publication of the Journals. He went with the late Duke of Richmond and his brother to France. At Paris he was introduced to the First Consul at the Institute. This year he was appointed foreign secretary of the Royal Society, and he held this office for the remainder of his life. He refused the appointment of secretary in 1812, because he thought it would interfere with his medical reputation. In 1803, on January 26, the lectures at the Institution recommenced. Young and Davy each gave weekly two day lectures and one evening lecture. On Tuesday and Friday the lectures were in the evening.