WASHINGTON, August 5, 1872. DEAR SIR,--I have seen the letter addressed to me by you through the public prints, and I notice especially, that, while animadverting upon my support of Horace Greeley, you say not one word in vindication of that compound of pretensions known as Grantism in contradistinction to Republicanism, which you would install anew in the Government. You are greatly concerned about the company I keep. To quiet your solicitude, I beg leave to say, that, in joining the Republicans who brought forward an original Abolitionist, I find myself with so many others devoted to the cause I have always served that I had not missed you until you hastened to report absence; nor had I taken account of the “Southern Secessionists,” who, as you aver, are now coöperating with me in support of this original Abolitionist, except to rejoice, that, if among former associates some like yourself hesitate, their places are supplied from an unexpected quarter. You entirely misunderstand me when you introduce an incident of the past, and build on it an argument why I should not support Horace Greeley. What has Preston Brooks to do with the Presidential election? Never, while a sufferer, did anybody hear me speak of him in unkindness; and now, after the lapse of more than half a generation, I will not unite with you in dragging him from the grave, where he sleeps, to aggravate the passions of a political conflict, and arrest the longing for concord. And here is the essential difference between you and me at this juncture. I seize the opportunity to make the equal rights of all secure through peace and reconciliation; but this infinite boon you would postpone. Seven years have passed since the close of our Civil War; but, unhappily, during all this period a hostile spirit has continued to exist between the contending sections, while the rights of colored fellow-citizens have been in perpetual question. Seven years mark a natural period of human life. Should not the spirit be changed with the body? Can we not after seven years begin a new life, especially when those once our foes repeat the saying, “Thy people shall be my people, and thy God my God”? I declare my preference for an original Abolitionist as President, and you seek to create a diversion by crying out that Democrats will support him. To which I reply, So much the better. Their support is the assurance that the cause he has so constantly guarded, whether of Equal Rights or Reconciliation, is accepted by Democrats; and this is the pledge of a true union beyond anything in our history. It is a victory of ideas, without which all other victories must fail.