To render such an establishment perfectly reasonable, with the circumstance of being reducible to strict rule and method, two other circumstances ought to concur.
A dynamic theory would begin by assuming that all history, terrestrial or cosmic, mechanical or intellectual, would be reducible to this formula if we knew the facts.
It is clear that an emotion is essentially complex, and we have to inquire whether it ever contains any non-physiological material not reducible to sensations and images and their relations.
To this analysis — if one understood it right — all matter whatever was reducible, and the only difference of opinion in science regarded the doubt whether a still deeper analysis would reduce the atom of gas to pure motion.