glass or dielectric; (4) his experimental demonstration of the identity of lightning and electricity; and (5) his invention of the lightning conductor for the protection of life and property, together with his clear statement of its preventive and protective functions."[i-383] Not only an inventor, Franklin inductively observed natural phenomena, and drew conclusions until he had created a virtual _Principia_ of electricity. His contemporaries were not loath to honor him as a second Newton. Franklin, however, was in all of his researches under a self-confessed yoke which doubtless tended to deny him access to the profoundest reaches of scientific inquiry: from Philadelphia he wrote in 1753 to Cadwallader Colden, eminent mathematician (as well as versatile scientist): "Your skill & Expertness in Mathematical Computations, will afford you an Advantage in these Disquisitions [among them, researches in electricity], that I lament the want of, who am like a Man searching for some thing in a dark Room where I can only grope and guess; while you proceed with a Candle in your Hand."[i-384] In an effort to learn the _modus operandi_ of Franklin's philosophic thought, let us now review its genetic development, its probable sources, its relation to scientific deism, and the degree to which he achieved that serene repose for which he ever strove. A pioneer American rationalist, not without his claims to being "another Voltaire," Franklin as a youth read those works which were forming or interpreting the thought patterns of the age. Born in an epoch presided over by a Locke and a Newton, an epoch of rationalism and "supernatural" rationalism, alike fed by physico-mathematical speculation. Franklin, barely beyond adolescence, felt the impacts of the age of reason. Scholars before and since M. M. Curtis have explained that "in religion he was a Deist of the type of Lord Herbert of Cherbury."[i-385] M. Faÿ has sought, without convincing documentary evidence, to interpret Franklin's philosophic mind in terms of Pythagoreanism.[i-386] We may find that these views are over simple and historically inadequate--even wrong.