In 1839 Mr. Martin sailed from Bristol to New York, and travelled thence to the extreme west of Upper Canada to visit a relative who had settled there. On that occasion he was absent from Ireland nearly twelve months, and during his stay in America he made some tours in Canada and the Northern States, visiting the Falls, Toronto, Montreal, Philadelphia, New York, Washington, Pittsburg, and Cleveland. In 1841 he made a brief continental tour, and visited the chief points of attraction along the Rhine. During this time Mr. Martin's political ideas became developed and expanded, and though like Smith O'Brien, he at first withheld his sympathies from the Repeal agitation, in a short time he became impressed with the justice of the national demand for independence. His retiring disposition kept him from appearing very prominently before the public; but the value of his adhesion to the Repeal Association was felt to be great by those who knew his uprightness, his disinterestedness, and his ability. When the suicidal policy of O'Connell drove the Confederates from Conciliation Hall, John Martin was not a silent spectator of the crisis, and in consequence of the manly sentiments he expressed with reference to the treatment to which the Young Ireland party had been subjected, he ceased to be a member of the Association. There was another cause too for his secession. A standing taunt in the mouth of the English press was that O'Connell pocketed the peoples' money and took care to let nobody know what he did with it. To put an end to this reproach Mr. Martin asked that the accounts of the Association should be published. "Publish the accounts!" shrieked the well-paid gang that marred the influence and traded in the politics of O'Connell: "Monstrous!" and they silenced the troublesome purist by suppressing his letters and expelling him from the Association. In the ranks of the Confederates, however, Martin found more congenial society; amongst them he found men as earnest, as sincere, and as single-minded as himself, and by them the full worth of his character was soon appreciated. He frequently attended their meetings, and he it was who filled the chair during the prolonged debates that ended with the temporary withdrawal of Mitchel from the Confederation. When the _United Irishman_ was started he became a contributor to its columns, and he continued to write in its pages up to the date of its suppression, and the conviction of its editor and proprietor.