The question of taxing the Penn proprietary estates in Pennsylvania, for the defense of the province from the French and Indians, had assumed such an acute stage in 1757 that the Assembly decided to petition the King upon the subject; and selected Franklin, then in the forty-first year of his age, to visit London and present their petition. The next forty-one years of his life were practically all spent in the diplomatic service. He was five years absent on this his first mission. Every interest in London was against him. He finally surmounted all obstacles by a compromise, which pledged the Assembly to pass an act exempting from taxation the unsurveyed lands of the Penn estate,--the surveyed waste lands, however, to be assessed at the usual rate. For his success the Penns and their partisans never forgave him, and his fellow colonists never forgot him. Franklin returned to Philadelphia in 1762, but not to remain. The question of taxing the colonies without representation was soon thrust upon them in the shape of a stamp duty, and Franklin was sent out again to urge its repeal. He reached London in November 1764, where he remained the next eleven years and until it became apparent that the surrender of the right to arbitrarily tax the colonies would never be made by England during the life of the reigning sovereign, George III. Satisfied that his usefulness in England was at an end, he sailed for Philadelphia on the 21st of March, 1775; and on the morning of his arrival was elected by the Assembly of Pennsylvania a delegate to the Continental Congress which consolidated the armies of the colonies, placed General George Washington in command of them, issued the first Continental currency, and assumed the responsibility of resisting the imperial government; his last hope of maintaining the integrity of the empire having been dissipated by recent collisions between the people and the royalist troops at Concord and Lexington. Franklin served on ten committees in this Congress. He was one of the five who drew up the Declaration of Independence in July 1776, and in September following was chosen unanimously as one of the three commissioners to be sent out to solicit for the infant republic the aid of France and the sympathies of continental Europe. In this mission, the importance of which to his country can hardly be exaggerated, he was greatly favored by the reputation which had preceded him as a man of science. While yet a journalist he had made some experiments in electricity, which established its identity with lightning. The publication by an English correspondent of the letters in which he gave an account of these experiments, secured his election as an honorary member of the Royal Society of London and undisputed rank among the most eminent natural philosophers of his time. When he arrived in Paris, therefore, he was already a member of every important learned society in Europe,