man to the world, and to every part and particle of it.
Many readers remember that Sir Humphry Davy said, when he was praised for his important discoveries, "My best discovery was Michael Faraday." In 1848 I had the privilege of hearing Professor Faraday deliver, in the Royal Institution in London, a lecture on what he called Diamagnetism,—by which he meant cross-magnetism; and he showed us various experiments on certain gases, to prove that whilst ordinarily magnetism of steel is from north to south, in other substances, gases, it acts from east to west. And further experiments led him to the theory that every chemical substance would be found to have its own, and a different, polarity. I do not know how far his experiments and others have been pushed in this matter, but one fact is clear to me, that diamagnetism is a law of the mind, to the full extent of Faraday's idea; namely, that every mind has a new compass, a new north, a new direction of its own, differencing its genius and aim from every other mind;—as every man, with whatever family resemblances, has a new countenance, new manner, new voice, new thoughts and new character. Whilst he shares with all mankind the gift of reason and the moral
