that the force of electricity could be extended through an indefinite circuit. The French savants conveyed the electric current through a circuit of twelve thousand feet. It belonged to Franklin, however, to raise the knowledge of electricity to the dignity of a science. By a series of experiments, extending from 1747 to 1760, he established the fact that electricity is not created by friction, but merely collected from its state of diffusion through other matter to which it has been attracted. He showed further that all the phenomena produced by electricity had their counterparts in lightning. As it was obvious that thunder clouds contained an immense quantity of the electrical element, he devised a means to draw it from the clouds by rods erected on elevated buildings. As this was not sufficiently demonstrative he succeeded at length in drawing the lightning from the clouds by means of a kite and silken string, so as to ignite spirits and other combustible substances by an electric spark similar to those from a Leyden jar. To utilize his discovery of the identity of lightning with electricity he erected lightning-rods to protect buildings, that is, to convey the lightning from the overhanging clouds through conductors to the ground. The importance of these lightning-rods was doubtless exaggerated. It is now thought by high scientific authorities that tall trees around a house are safer conductors in a thunder storm than metallic rods; but his invention was universally prized most highly for more than one hundred years, and his various further experiments and researches raised his fame as a philosopher throughout Europe. His house was a museum of electrical apparatus, and he became the foremost electrician in the world. His essays on the subject were collected and printed abroad, and translated into several languages, and among the scientists and philosophers of Europe he was the best known American of his time; while at home both Harvard and Yale Colleges conferred on this self-educated printers-apprentice the degree of Master of Arts.