In 1736 Franklin was chosen a clerk of the general assembly, and was re-elected the following year. He was then elected a member of assembly, to which dignity he was re-elected for ten successive years, and was appointed one of the commissioners to treat with the Indians at Carlisle. In 17 37 Colonel Spotswood, then postmaster-general, appointed him deputy postmaster at Philadelphia. About this time he organized the first police force and fire company in the colonies, and a few years later initiated the movements which resulted in the foundation of the university of Pennsylvania and of the American Philosophical Society, in the organization of a militia force, in the paving of the streets, and in the foundation of a hospital; in fact, he furnished the impulse to nearly every measure or project which contemplated the welfare and prosperity of the city in which he lived. It was during this period, and in the midst of these very miscellaneous avocations, that he made the discoveries in electricity which have secured him undisputed rank among the most eminent of natural philosophers. He was the first to demonstrate that lightning and electricity were one. The Royal Society, when an account of his experiments, which had been transmitted to a scientific friend in England, was laid before it, made sport of them, and refused to print them. Through the recommendation of his friend they were printed, however, in an extra number of the _Gentleman's Magazine_, of which the publisher ultimately sold five editions. A copy chancing to fall into the hands of Buffon, he saw their value, and advised their translation and publication in France, where they immediately attracted attention. The "Philadelphia experiments," as they were called, were performed in the presence of the royal family in Paris, and became the sensation of the period. The Royal Society of London found it necessary to reconsider its action, published a summary of the experiments in its _Transactions_, and, as Franklin afterwards averred, more than made him amends for the slight with which it had before treated him, by electing him an honorary member, exempting him from the customary payments, and sending him for the rest of his life a copy of the _Transactions_. Since the introduction of the art of printing, it would be difficult to name any discovery which has exerted a more important influence upon the industries and habits of mankind.