It would exceed the limits of such a discourse as the present to give even an outline of the advancement of reason, as exhibited in the various branches of science. Nor is it necessary. It will be sufficient for us to give our attention to some few striking facts in the progress of science and art, especially in those cases which being more recent, are at once better known to us, and have a nearer relation to our interests. Let us turn to any department of human knowledge or inquiry, and we see the clearest manifestations of the growing philosophical spirit of which I speak. If we look at the character of civil government, we find that every revolution--every important change--is the result of the progress of philosophy--of the extension of the empire of reason. Once kings were regarded as deriving their power not from the consent of the people, but immediately from the Deity. They were said to be the Lord's anointed; and implicit obedience--unresisting submission to the mandate of the sovereign, was enjoined not merely as a civil, but as a religious duty. In two out of the four quarters of the world, we all know how much these opinions are changed; and that there, with the thinking portion at least, government is now regarded as an institution created solely for the happiness of the people; that they are the judges of what constitutes that happiness; and that government may be changed, either as to its form or agents, whenever it is proved incapable of fulfilling its main purpose. This principle of reason and common sense caused and justified the establishment of the Commonwealth in England; the restoration of the monarchy; the subsequent revolution in 1688; the American revolution in 1776; the French revolution of 1789, under all its various phases; and that which produced a change of dynasty in 1830. We have seen the operation of the same principle in separating the Spanish provinces on this continent from the mother country. We have seen it in the separation of Belgium from Holland, and in the liberation of Greece from the Turkish yoke.