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 sentiment, there is a teaching for him from within, which is leading him in a new path, and, the more it is trusted, separates and signalizes him, while it makes him more important and necessary to society. We call this specialty the _bias_ of each individual. And none of us will ever accomplish anything excellent or commanding except when he listens to this whisper which is heard by him alone. Swedenborg called it the _proprium_,--not a thought shared with others, but constitutional to the man. A point of education that I can never too much insist upon is this tenet, that every individual man has a bias which he must obey, and that it is only as he feels and obeys this that he rightly develops and attains his legitimate power in the world. It is his magnetic needle, which points always in one direction to his proper path, with more or less variation from any other man's. He is never happy nor strong until he finds it, keeps it; learns to be at home with himself; learns to watch the delicate hints and insights that come to him, and to have the entire assurance of his own mind. And in this self-respect, or hearkening to the privatest oracle, he consults his ease, I may say, or need never be at a loss. In morals this is conscience; in intellect, genius; in practice, talent;--not to imitate or surpass a particular man in _his_ way, but to bring out your own new way; to each his own method, style, wit, eloquence. 'Tis easy for a commander to command. Clinging to Nature, or to that province of nature which he knows, he makes no mistakes, but works after her laws and at her own pace, so that his doing, which is perfectly natural, appears miraculous to dull people. Montluc, the great Marshal of France, says of the Genoese admiral,