"With fervent desires that the beneficent Creator and Father of the Universe may open the eyes of all to see that 'the fast which he hath chosen is to loose the bands of wickedness, to undo the heavy burdens and to let the oppressed go free, and that ye break every yoke.' "I am thy sincere friend, "ISAAC T. HOPPER." Soon after the circumstances above related, the mayor of New-York revoked the warrant of the marshal, who had been so conspicuous in the outrage. This step was taken in consequence of his own admissions concerning his conduct. In 1837, a little incident occurred, which may be interesting to those who are curious concerning phrenology. At a small social party in New-York, a discussion arose on that subject; and, as usual, some were disposed to believe and others to ridicule. At last the disputants proposed to test the question by careful experiment. Friend Hopper was one of the party, and they asked him to have his head examined by the well-known O.S. Fowler. Having a good-natured willingness to gratify their curiosity, he consented. It was agreed that he should not speak during the operation, lest the tones of his voice might serve as an index of his character. It was further stipulated that no person in the room should give any indication by which the phrenologist might be enabled to judge whether he was supposed to be speaking correctly or not. The next day, Mr. Fowler was introduced blindfolded into a room, where Isaac T. Hopper was seated with the party of the preceding evening. Having passed his hands over the strongly developed head, he made the following statement, which was taken down by a rapid writer, as the words fell from his lips. "The first and strongest manifestation of this character is efficiency. Not one man in a thousand is capable of accomplishing so much. The strong points are very strong; the weak points are weak; so that he is an eccentric and peculiar character. "The pole-star of his character is moral courage. "He has very little reverence, and stands in no awe of the powers that be. He pays no regard to forms or ceremonies, or established customs, in church or state. He renders no homage to great names, such as D.D.; L.L.D.; or Excellency. He treats his fellow men with kindness and affection, but not with sufficient respect and courtesy. "He is emphatically republican in feeling and character. He makes himself free and familiar with every one. He often lets himself down too much. This constitutes a radical defect in his character. "He will assert and maintain human rights and liberty at every hazard. In this cause, he will stake anything, or suffer anything. This constitutes the leading feature of his character. Every other element is blended into this. "I should consider him a very cautious man in fact, though in appearance he is very imprudent; especially in remarks on moral subjects.