IV. Effects of Substances in the Cosmos and in the Human Body

First and foremost we must turn our attention to a substance which is particularly important, which is abundant on the earth and indeed in the universe, and is present in the meteors which fall on the earth. This substance is iron. Iron exists in such abundance on the earth that the whole of our modern culture and civilisation may be said to be based on it. Just think of all the purposes for which iron is used! It is only quite recently that people have begun to manufacture all sorts of things from substances other than iron. During the last two centuries all the great advances, as well as our social conditions, have been due to iron. We must assume that iron is everywhere present in the universe because when anything falls to the earth from the heavens, it is found to be of iron.