Meanwhile, Horatio Walpole, the auditor-general, with an eye to his own personal advantage, had brought forward a project of the Board of Trade for overruling the charters of the colonies; but the strenuous opposition of William Bollan and Eliakim Palmer for Massachusetts and Connecticut made the advocates of the measure waver, and the movement failed. Shirley was devising a plan of his own, which looked to such an extension of the parliamentary prerogative as had not yet been attempted. His scheme was to build and maintain a line of posts at the eastward, the expense of which all the colonies should share under a tax laid by Parliament.[300] In the pursuit of this plan, Shirley obtained leave of absence, and went to England (1749), while the conduct of affairs was left in the hands of Spencer Phips, the lieutenant-governor, a man of experience and good intentions, but not of signal ability. Thomas Hutchinson, James Otis, and two others meanwhile went to Falmouth to engage the eastern Indians, who were far from quiet, in a treaty, which was finally brought to a conclusion on October 16, 1749. In the following winter (1749-50), Sylvanus Cobb was in Boston fitting out his sloop for a hostile raid through the Bay of Fundy; but Cornwallis at Halifax thought the preparations for it had become known to the French, and the raid was not accomplished. The next year (1750), Parliament touched the provinces roughly. The English tanners wished for bark, and they could get it cheap if the English land-owners could sell their wood to the furnaces, and the furnaces would buy it if they could find a sufficient market for their iron and steel, as they could do if they had no rivals in America. It was a chain of possibilities that Parliament undertook to make realities, and so passed an act forbidding the running of slitting and rolling mills in the colonies, and Charles Townshend, who introduced the bill, found no opposer in Shirley. The bold utterances that Jonathan Mayhew was making in indignant Boston carried a meaning that did not warn, as it might, the Board of Trade in England.