President Grant has to-day performed il act "ït'iiicïi appearö to be tile most íigh-handed abuse of bis official power which he has perpetraied yet. As s well known, Gen. Custer gave imjortant testimony before the investiga;ion cominittees relative to the post■radership frauds, and was subpoenaed )j the Honse managers as a witness in he impeachment trial. In obedience to ihat subpoena he carne on, and bas been ïere for some days. To-day the President relieved him from bis command. When the news canio to Gen. Sherman and Secretary Taft, both went to the President and protested that it would not do. Gen. tíhermftn went iurther, and said tliat Cüster was üöt only the best man, but the oniy man fit to lead the expedition now fitting out against the Indians. To all their entreaties Grant turned a deaf ear, and said that if they could not flnd a man to lead the expedition, he would flnd one; that this man Custer had come on here both as a witness and a prosecutor in the Belknap matter to besmirch his administration, and he proposed to put a stop to it. By advice of Gon. Sherman and Secretary Taft, Gen. Custer went to the Whitehouse to cali on the President, although he said he did not believe it would be of any üse, for he had dono nothing but his duty, nothing that he had any apologies to make for doing, and nothing but what he would do again under the same circumstances. He had come on here in obedience to law. Nevertheless, the deference to their judgment, he went to tho White-house and sat in the waitingroom unsent for until ihe President's caüing hour was over, although he repeatedly sent in his card. Finally he wrote a letter to the President and left it, in which he stated that he called for the purpose of disabusing the President's mind, if ho had heard any statements that he (Custer) had said or done anything against the President personally. It is understood that the President will publicly assign as his reason for relieving Custor that he is here and will not be back to his command in time to take chargo of the expedition now getting reády to start against the Indians ; but it is also understood that Gen. Custer will be back in time, for the managers have relieved him from their subpoena, and Gen. Grant will have to make some other excuse to the people.