We therefore confine ourselves at present to a particular notice of one point only in Dr. Brownson's argument, to which we desire to call special attention. We allude to his exposition of his views in regard to the relation of the Catholic religion to the principles of the American constitution. Dr. Brownson is a thorough Catholic and a thorough American. As a Catholic, he condemns all the errors condemned by the syllabus of Pius IX. As an American, he accepts all the principles of the constitution of the United States. As a philosopher, he reconciles and harmonizes the two documents of the ecclesiastical and political sovereignties to which he owes allegiance. If he were wavering or dubious in obeying the instructions of the encyclical, his exposition of the relation between Catholic and American principles would have no weight whatever; for it would be merely an exposition of his own private version of Catholicity and not of the authorized version. If he were not thoroughly American, his exposition of the Catholic's ideal conception of the relations of the church and civil society might be very perfect, but it would rather confirm than shake the common persuasion that there is a contrariety between the principles of our political order and those of the Catholic Church. If he were not a philosopher, he might present both his religious and his political doctrines, separately, in such a way as to satisfy the claims both of orthodoxy and of patriotism; but he would not be able to show how these two hemispheres can be joined together in a complete whole. It is one of his greatest merits that he is perpetually aiming at the construction of these synthetic harmonies of what we may call, for the sake of the figure, the different gospels of truth, and is perpetually approximating nearer and nearer to that success which perhaps cannot be fully achieved by any human intellect. We think he has substantially succeeded in the task undertaken in the present volume, and we commend it to the perusal of all Americans, whether Catholics or non-Catholics, in the hope that it may strengthen both in the determination to do no injustice to each other, and to remain always faithful to the allegiance we owe to the American republic. We recommend it also to Dr. Brownson's numerous admirers and friends in Europe as a valuable aid to the understanding of what are commonly called American principles. So far as the exterior is concerned, this is one of the very finest books which the Sadliers have yet published. * * * * * THE END OF THE WORLD, AND THE DAY OF JUDGMENT. Two Discourses preached to the Music Hall Society, by their minister, the Rev. William Rounseville Alger. Published by request. Boston: Roberts Brothers.