The Atomic Theory affords a good example of the "method of ignorance." When we try to think about material objects generally--to generalise about them--that is, to find some attribute or attributes common to them, we are at first puzzled. They present such an immense variety. But after a time, by dint of stripping off or abstracting all such attributes or qualities as we think we perceive in one body and not in another--as for example, redness, blueness, warmth, saltness, life, intelligence, or what not--we find an attribute left, namely resistance to touch, which is common to _all_ material bodies. This quality in the body we call "mass," and since it is only known by motion, mass and motion become correlative attributes which we find useful to class bodies by, not because they represent the various bodies particularly well, but because they are found in all bodies; just as you might class people by their boots--not because boots are a very valuable method of classification, but simply because every one wears boots of one kind or another. So far there is no great harm done. But now having by the method of ignorance _thought away_ all the qualities of bodies, except the two correlatives of mass and motion, we set about to _explain_ the phenomena of Nature generally by these two "thinks" that are left. We credit these "thinks" (mass and motion) with an independent existence and proceed to derive the rest of phenomena from them. The proceeding of course is absurd, and ends by exposing its own absurdity. Thinking of mass and motion as existing in the various bodies _apart_ from colour, smell, and so forth--which of course is not the case--we combine the two attributes into one concept, the atom, which we thus assume to exist in all bodies. The atom has neither colour, smell, warmth, taste, life or intelligence; it has only mass and motion; for it came by the method of divesting our thought of everything _but_ mass and motion. It is a projection of a "think" upon the background of nature. And it is an absurdity. No such thing exists in all the wide universe as mass and motion divested from colour, smell, warmth, life and intelligence. The atom is unthinkable. It is perfectly hard and it is perfectly elastic--which is the same as saying that it bends and it doesn't bend at the same time; it has form, and it hasn't form; it has affinities and yet is perfectly indifferent. To justify to men the ways of their Mumbo Jumbo has sorely exercised the votaries of the Atom. One philosopher says that it is mere matter, passive, exercising no force but resistance; another says that it is a centre of force, without matter; a third suggests that it is not itself matter, but only a vortex in other matter! All agree that it is not an object of sense, and there remains no conclusion but that it is nonsense![27]