It was expected that Thaddeus Stevens would follow him, and the public interest which attached to his speaking was probably greater than that attending any of the other counsel; but for some reason he declined speaking in the cause, and Mr. Read was followed by Senator Cooper, who represented not only the State of Maryland, but the Gorsuch family. He expounded with the ability of a profound lawyer the constitutional definition of treason and applied it to the facts of the case, which he insisted fully, amply and distinctly proved the overt act of treason. In the cases of contradiction between Lewis and Kline he declared that Kline was supported by the testimony of all the Maryland party, while Lewis stood alone, and Lewis was an interested and therefore discredited witness. His peroration was an earnest plea for the Union and against anything that would affect its stability or endanger its peace. In Websterian strain he closed as follows: “The eyes of the world are upon the constellation in its banner. Its stars are the beacons of liberty. Let us then, for our sakes, and for the sake of liberty in other lands, guard it as the Ark of the Covenant was guarded of old. Let no hand deface it. Let the day never come when it shall be rent in twain; when one cluster of its stars, separated from the other and beaming in different banners, shall be borne over adverse and conflicting hosts; but let it remain as it now is, ‘the Flag of the Union,’ still waving over the heads of united freemen, obedient to the same laws--laws supported by all, sustained by all, vindicated by all, in every section of the country.” The argument of the case closed with Senator Cooper’s speech and he was immediately followed by Justice Grier’s charge to the jury. After the judge had made a general exposition of the law, he paid a high tribute to the manner in which the case had been conducted on both sides by counsel. He framed the issues to be determined by the jury as two-fold, involving first the question as to whether Hanway participated in the offenses proved to have been committed, and, secondly, if he did so, was his offence treason? In undertaking to vindicate the reputation of the people of Pennsylvania he left no doubt as to his own individual views upon the subject of the anti-slavery agitation then prevailing, and the following extracts from his charge, which were savagely resented at the time of their utterance even by those who were satisfied with his legal conclusion, are reported to have been uttered in a shrill and piping voice, which added to the intensity of their expression: