In Poland, the serfdom of the peasants was never sanctioned by law, but existed in later times by reason of exception and abuse. Stanislas Leszczynski, King of Poland, in 1720 raised his voice in favor of the peasant population; the same principles were in 1768 defended, sword in hand, by the Confederation of Bar, discussed in the diets of 1776, 1780, 1788, and finally adopted by the famous Constituent Assembly of 1791. Thadeus Kosciuszko (May 7th, 1794), then Dictator of Poland, issued a document giving entire personal liberty to all serfs; and on the 22d of January, 1863, the members of the 'National Polish Government' decreed that the peasants were not only free, but were entitled to a certain portion of land, of which they should be the sole proprietors. In 1861, Russia emancipated all serfs within her borders. In the United States, the stern 'logic of events' seems to be rapidly bringing about similar results, although indeed 'slavery' and 'serfdom' should never be mentioned together, being so essentially different; the one the possession of the _man_, the other merely the ownership of his _labor_ or of a _portion of its results_. We cannot better conclude than by giving the following extract from the Introduction of M. Cochin, who, by the way, is a man of good family and ample fortune, an eminent publicist, and a Catholic of the school of Lacordaire, Montalembert, Monseigneur d'Orleans, and the Prince de Broglie: 'It was once exclaimed, Perish the colonies, rather than a principle! The principle has not perished, the colonies have not perished. 'It is not correct that interests should yield to principles; between legitimate interests and true principles, harmony is infallible; this is truth. Those who look only to interests are sooner or later deceived in their calculations; those who, exclusively occupied with principles, are generous without being practical, cease to be generous, for they lead the cause which they serve to certain destruction. It is the will of God that realities should mingle with ideas, and that material obstacles should compel the purchase of progress by toil.' The publishers tell us that, a large demand for this work having arisen, they have issued this 'popular edition,' wherein the figures in the original are given as nearly as possible in the American currencies, measures, etc. STUMBLING BLOCKS. By GAIL HAMILTON, Author of 'Country Living and Country Thinking,' 'Gala Days,' etc. Boston: Ticknor & Fields, For sale by D. Appleton & Co., New York.