 Hume’s “science of man” will not permit a realist interpretation of forces as real causes (see, for different arguments, Broughton 1987; Bell 1997). When the sciences talk about forces or powers, these words must be reinterpreted (for example, the note to EHU, 4.2.16 tells us to look for this in section 7 of EHU). According to Hume, word’s like “force” and “power” have, at best, a reference to “an effect, or some other event”. And 