Of the excellence of the LETTERS TO EUGENIA, nothing need here be said. The work speaks for itself, and abounds in that eloquence peculiar to its author, and overflows with kindly sentiments of humanity, benevolence and virtue. Like d'Holbach's other works, it is distinguished by an ardent love of liberty, and an invincible hatred of despotism; by an unanswerable logic, by deep thought, and by profound ideas. The tyrant and the priest are both displayed in their true colors; but while the author shows himself inexorable as fate towards oppressive hierarchies and false ideas, he is tender as an infant to the unfortunate, to those overburdened with unreasonable impositions, to those who need consolation and guidance, and to those searching after truth. Addressed, as the LETTERS were, to a lady suffering from religious falsehoods and terrors, the object of the writer is set forth in the motto from Lucretius which he placed on the title page, and which may thus be expressed in English:-- "Reason's pure light I seek to give the mind, And from Religion's fetters free mankind." A. C. M. The name of the lady was designedly kept in secrecy, and was unknown, except to _a very few_, till some years after d'Holbach's death. We now know from the _Feuilles Posthumes_ of Lequinio, who had it from Naigeon, that the _Letters_ were written several years before their publication, for the instruction of a lady formerly distinguished at the French Court for her graces and virtues. They were addressed to the charming Marguerite, Marchioness de Vermandois. Her husband held the lucrative post of farmer-general to the king, and besides inherited large estates. He possessed excellent natural abilities, and his mind was strengthened and adorned by culture and letters. Had his modesty permitted him to appear as such, he would now be known as a poet of genius and merit, for he wrote some poems and plays that were much admired by all who were allowed to peruse them. He was married in 1763, on the day he completed his twenty-first year, to Marguerite Justine d'Estrades, then only nineteen years of age, and whom he saw for the first time in his life only six weeks before they became husband and wife. Like most of the matches then made among the higher classes in France, this was one of a purely mercenary character. The father of the Marquis de Vermandois, and the father of Marguerite, as a means of joining their estates, contracted their children without deigning to consult the wishes of the parties, and obedience or disinheritance was the only alternative. When the compact was concluded, Marguerite was taken from the convent where for five years she had lived as a boarder and scholar, and commenced her married life and her course in the fashionable world at the same time. The match was far more fortunate than such matches then generally proved to be. Marguerite's husband was passionately attached to her, and that