 The word ‘disposition’ …, is useful in dealing with complicated causal situations, where some specified sort of event is a function of many variables. To illustrate … Although coffee often ‘causes’ stimulation, it is never the only cause. The degree of stimulation will depend as well on many other factors—the initial state of a man’s fatigue, the absorptive state of his stomach, the constitution of his nervous system, and so on. (1944, 46)