 The point is not just that an account of numerical singularity in general is required (the “indeterminate unity by which anything in a species is said to be one in number”). What is required, rather, is an account of the individuality of any given particular, and this account will explain its being indivisible into subjective parts. (Scotus does not use the term ‘haecceity’ [haecceitas] in the work that I am using here – the Ordinatio. He talks rather about the individual difference, or individual entity. But he does elsewhere talk about this entity as a haecceitas [a term of Scotus’s own invention]: for the change in terminology, see Dumont [1995]).