"Campbell's appointment was suspended because we were advised that the incumbent was ill and a conservative; that, while absent for the benefit of his health, the office is being administered by the deputy, who is a hearty supporter of the President. Under the circumstances of the case it was thought best by some of our judicious friends that no change should take place in the office; at all events, until after the election. "The decision of the President to withhold from Mr. Campbell his commission was not influenced by the representation of any gentlemen unfriendly to Mr. Campbell or his brother, the candidate for Congress, but rather from a desire to do nothing which might impair the administration's strength in the district. After the election the subject will receive due consideration. "In regard to the 12th district, I have only to say that a good deal of disapprobation has been expressed by the appointment of Mackin as assessor; and as there seemed to be a good deal of difference of opinion among our friends in the district in regard to the removal of the collector, it was thought advisable to make no change in that office for the present. "It is pretty clear to my mind that in order that an office should be made effective in an election, it is important that the office should be fully and properly organized some time in advance. "The President desires to make as few changes as possible, and none on political grounds unless it is clear that the interests of the service or the interests of the administration are to be certainly benefited by them. I will, however, present this case again to the President. "I am, very truly, Yours, "H. MCCULLOCH, "_Secretary_. "_Hon. S. J. Tilden, New York._ "I return Mr. Campbell's letter." TILDEN TO MAJ.-GEN. JOHN A. DIX "NEW YORK, _Nov. 20th, 1866_. "MAJ.-GEN. JOHN A. DIX. "DEAR SIR,--As you are about to leave our country for the distinguished post in the diplomatic service to which you have been assigned by the government, we avail ourselves of the occasion to express to you the respect and esteem which we entertain for your personal and public character, and invite you to partake with us a private dinner at the Union Club at such time as you may conveniently designate. "With much respect, "We remain, very truly, "Your friend, "----. "NEW YORK, _Nov. 20th, 1866_." S. E. CHURCH TO S. J. T. "_Private._ "ROCHESTER, _March 8, '67_. "HON. SAML. J. TILDEN.