MY DEAR SIR: My last to you was written in a hurry--in the midst of business in the Senate, and I have not a precise recollection of its terms--but I desire now to write you a little more fully in regard to this Cameron movement, and in doing so, I have no other desire than the success of our Administration. Cameron is very generally regarded as a trading, unscrupulous politician. He has not the confidence of our best men. He is a great manager and by his schemes has for the moment created an apparent public sentiment in Penna. in his favor. Many of the persons who are most strenuously urging his appointment are doubtless doing it in anticipation of a compensation. It is rather an ungracious matter to interfere to oppose his selection and hence those who believe him unfit and unworthy of the place [Copy illegible] seems to me he is totally unfit for the Treasury Department. You may perhaps ask, how, if these things are true, does he have so many friends, and such, to support him, and such representative men. I am surprised at it, but the world is full of great examples of men succeeding for a time by intrigue and management. Report says that C. secured Wilmot in his favor by assurances of support for the Senate, and then secured Cowan by abandoning W. at the last. The men who make the charges against Cameron are not all, I am sure, either his personal enemies, or governed by prejudice. Another very serious objection to Cameron is his connection with Gov. Seward. The Governor is a man who acts through others and men believe that Cameron would be his instrument in the Cabinet. It is my decided conviction that C.'s selection would be a great mistake and it is a pity he is [Copy illegible] Gov. Seward's appointment is acquiesced in by all our friends. Some wish it were not so, but regard it rather as a necessity, and are not disposed to complain. There is a very general desire here to have Gov. Chase go into the Cabinet and in that wish I most heartily concur. In my judgment you had better put Chase in the Cabinet and leave Cameron out, even at the risk of a rupture with the latter, but I am satisfied he can be got along with. He is an exacting man, but in the end will put up with what he can get. He cannot get along in hostility to you, and when treated fairly, and as he ought to be, will acquiesce. This letter is, of course, strictly confidential. There is a reaction here and the danger of an attack on Washington is, I think, over. Very truly your friend, LYMAN TRUMBULL. The newspapers soon got hold of the fact that a place in the Cabinet had been offered to Cameron. They did not learn that he had been asked to decline it. Letters began to reach Trumbull urging him to use his influence to prevent such a calamity. For example: