author undertook the work, a translation of which is here presented to the public. "What do history and philosophy say on this subject? How has man, either individually or collectively, considered in a religious, social, political, or literary point of view, been benefited by the reform of the 16th century? Did Europe, under the exclusive influence of Catholicity, pursue a prosperous career? Did Catholicity impose a single fetter on the movements of civilization?" Such is the important investigation which the author proposed to himself, and it must be admitted that he has accomplished his task with the most brilliant success? Possessed of a penetrating mind, cultivated by profound study and adorned with the most varied erudition, and guided by a fearless love of truth, he traverses the whole Christian era, comparing the gigantic achievements of Catholicity, in curing the evils of mankind, elevating human nature, and diffusing light and happiness, with the results of which Protestantism may boast; and he proves, with the torch of history and philosophy in his hand, that the latter, far from having exerted any beneficial influence upon society, has retarded the great work of civilization which Catholicity commenced, and which was advancing so prosperously under her auspicious guidance. He does not say that nothing has been done for civilization by _Protestants_; but he asserts and proves that _Protestantism_ has been greatly unfavorable, and even injurious to it. By thus exposing the short-comings, or rather evils of Protestantism, in a social and political point of view, as Bossuet and others had exhibited them under the theological aspect, Balmes has rendered a most important service to Catholic literature. He has supplied the age with a work, which is peculiarly adapted to its wants, and which must command a general attention in the United States. The Catholic, in perusing its pages, will learn to admire still more the glorious character of the faith which he professes: the Protestant, if sincere, will open his eyes to the incompatibility of his principles with the happiness of mankind: while the scholar in general will find in it a vast amount of information, on the most vital and interesting topics, and presented in a style of eloquence seldom equalled. "The reader is requested to bear in mind that the author was a native of Spain, and therefore he must not be surprised to find much that relates more particularly to that country. In fact, the fear that Protestantism might be introduced there seems to have been the motive which induced him to undertake the work. He was evidently a man of strong national as well as religious feeling, and he dreaded its introduction both politically and religiously, as he considered that it would be injurious to his country in both points of view. He thought that it would destroy the national unity, as it certainly did in other countries.