Bird on Dispositions and Antidotes

In The Philosophical Quarterly , 48 (1998), Alexander Bird raises an objection against the conditional analysis of dispositions: where an 'antidote' is present all the supposed conditions for manifestation of a disposition are fulfilled but the manifestation does not occur. But Bird's argument suffers from equivocation. If we spell out properly whether the disposition's conditions are to include the presence of the antidote or not, the apparent counter-examples disappear. So his examples do not undermine the conditional analysis of dispositions; they show merely that we need to be careful about describing the examples consistently.