August 8. 1831
Iron — Galvanism — Heat
Iron is the most ductile of all hard metals, and the hardest of all ductile metals. With the exception of nickel, in which it is dimly seen, iron is the only metal in which the magnetic power is visible. Indeed, it is almost impossible to purify nickel of iron.
Galvanism is the union of electricity and magnetism, and, by being continuous, it exhibits an image of life;—I say, an image only: it is life in death.
Heat is the mesothesis or indifference of light and matter.