The most remarkable instance, I think, of vigor of mind in any man ever born, was that of C?sar, the Dictator. I am not at present alluding to his valor and courage, nor yet his 52 exalted genius, which was capable of embracing everything under the face of heaven, but I am speaking of that innate vigor of mind, which was so peculiar to him, and that promptness which seemed to act like a flash of lightning. We find it stated that he was able to write or read, and, at the same time, to dictate and listen. He could dictate to his secretaries four letters at once, and those on the most important business; and, indeed, if he was busy about nothing else, ............