The work of Professor Christy, on the Economical Relations of Slavery, contains a large amount of the most accurate, valuable and well arranged statistical matter, and his combinations and deductions are remarkable for their philosophical accuracy. He spent several years in the service of the American Colonization Society, as agent for Ohio, and made himself thoroughly acquainted with the results, both to the blacks and whites, both of slavery and emancipation. Governor Hammond is too well known, as an eminent statesman and political writer, to require notice here. His letters are addressed to Mr. Clarkson, of England, who, in conjunction with Wilberforce, after a long struggle, at last secured the passage, by the Parliament of Great Britain, of acts to abolish the slave trade and slavery, in the British West India colonies. The results of this are vividly portrayed by the author, and his predictions are now history. Chancellor Harper, with a master hand, draws a parallel between the social condition of communities where slave labor exists and where it does not, and vindicates the South from the aspersions cast upon her. Dr. Bledsoe's "Liberty and Slavery," or Slavery in the Light of Moral Science, discusses the right or wrong of slavery, exposes the fallacies, and answers the arguments of the abolitionists. His established reputation as an accurate reasoner, and a forcible writer, guarantees the excellence of this work. Dr. Stringfellow's Slavery in the Light of Divine Revelation, and Dr. Hodge's Bible Argument on Slavery, form a synopsis of the whole theological argument on the subject. The plain and obvious teachings, of both Old and New Testament, are given with such irresistible force as to carry conviction to every mind, except those wedded to the theory of a "Higher Law" than the Law of God.