 A fusion of the domains of language and reality also turns up in Peter’s account of the consecutive ‘if’, which he explains as signifying causality. Like his contemporaries he looks into the question whether from something impossible anything follows. In his account, the notion of ‘impossibility’ can be taken in two ways, viz. impossibility as such (or absolute impossibility), which amounts to nothing, or some impossible state of affairs, that is a combination of notions that do have a real foundation but are incompatible. From the latter type of impossibility, such as ‘A man is an ass’, something, but not anything can follow, e.g., ‘Therefore a man is an animal’. From impossibilities as such, e.g., ‘You know that you are a stone’, nothing can follow. The fundamental idea is that in order for something to follow from an antecedent, the antecedent in the consecutive relationship must be a something (res) of some sort (see Spruyt 1993, pp. 161–193).