The "Review of the War with Mexico" stands among Judge Jay's volumes unexcelled by exactness of congressional, diplomatic, and, to some extent, military research; and by plainness of speech in regard to national outrages and perfidy without a name, perpetrated in the cause of slavery; and his writings generally on this subject show the same accurate inquiry and outspoken frankness. It was on the varied phases of our treatment of the coloured people, free and slave, at our own doors, the cruel wrong so full of injustice to the blacks, of scandal to Christendom, and of menace to the republic, that Jay wrote with deepest earnestness, the most exacting research, and a fearless pen. His inquiry into "The American Colonization and the Antislavery Societies" and "The Action of the Federal Government in Behalf of Slavery," developed facts which implicated prominent politicians of both parties, and aroused at once their surprise and indignation, while the disclosure directly appealed to the pride and conscience of the American people. The same judicial, dauntless, and defiant spirit marked the appeals which he prepared for the Antislavery Society against the calumnies of the press, and the dignified protest against the libellous charges so unworthily made by President Jackson in his message to Congress. The same spirit animated his address on "The Condition of the People of Colour in the United States"; the "Appeal to the Friends of Constitutional Liberty, on the Violation by the House of Representatives of the Right of Petition"; his supplement to "The Reproof of the American Church," by Bishop Wilberforce of Oxford; the exposure in the letter to Bishop Ives of the clerical efforts to sanctify slavery and caste; and his earnest demand for the equal admission of the coloured churches to the Diocesan Council of New York. So, too, with the critical analysis of Mr. Clay's "Compromise Bill," including the Fugitive Law and Mr. Webster's "Theory of Physical Geography"; his address to the inhabitants of New Mexico and California, so timely distributed in English and Spanish, and so happily followed in California by a free constitution, urging them to resist the domination of slavery with its ignorance and degradation, and to secure, by their own manly independence and just statesmanship, a glorious future of power and happiness; his address to the antislavery Christians; and his plain reminders to the Protestant Episcopal Church, and to the Tract and other societies, of the inconsistency and evil influence of their compromising pro-slavery policy. CONSTITUTIONAL PRINCIPLES--AN HISTORIC PARALLEL.