DEAR SIR--I am about to publish a work, entitled "Cannibals All; or, Slaves Without Masters." I shall, in effect, say, in the course of my argument, that every theoretical abolitionist at the North is a Socialist or Communist, and proposes or approves radical changes in the organization of society. I shall cite Mr. Greely, Mr. Goodell, S. P. Andrews, Gerrit Smith, yourself, and other distinguished and leading abolitionists, of both sexes, as proof of my assertion. I shall also endeavor to show that all the literary mind of Western Europe concurs with you. You, I perceive, have read a work already written by me, and will not mistake my object. We live in a dangerous crisis, and every patriot and philanthropist should set aside all false delicacy in the earnest pursuit of truth. I believe Slavery natural, necessary, indispensable. You think it inexpedient, immoral and criminal. Neither of us should withhold any facts that will enable the public to form correct opinions. Should you not reply to this letter, I shall publish a copy of it in my book, and insist that your silence is an admission of the truth of my charges. I regret that your very able paper reaches me irregularly. Your obedient servant, GEO. FITZHUGH. LOYD GARRISON, Esq., Boston, Mass. LETTER TO MR. GREELY. _Port Royal, Va._, July 20, 1856. DEAR SIR--I am writing a work, entitled, "Cannibals All; or, Slaves Without Masters." I shall state, as a matter of fact, that all theoretical abolitionists assert the failure of free society, and each proposes some plan for its re-organization. I shall cite particularly yourself, Gerrit Smith, S. P. Andrews, Mr. Goodell and Mr. Garrison. I shall rely on your discussion with the Courier and Enquirer, which has been burnt, chiefly as my proof of your opinion. I wish to afford you, and other distinguished gentlemen, an opportunity of correcting me if I have come to erroneous conclusions. I have, therefore, written to Mr. Garrison, and I now write to you, to afford you an opportunity to correct me if I am wrong. I know you all think our society a greater failure than your own; but you can _admit_ it for yourselves, not for us. I shall publish a copy of this letter in my book, if you do not reply, (and possibly if you reply,) both this letter and your answer. 'Tis not possible that our two forms of society can long co-exist. All Christendom is one republic, has one religion, belongs to one race, and is governed by one public opinion. Social systems, formed on opposite principles, cannot co-endure. With much respect, Your obedient servant, GEO. FITZHUGH.