Publications of Place that refer to Armstrong (1978). Universals and Scientific Realism (two volumes).

Place, U. T. (1996d). A conceptualist ontology. In D. M. Armstrong, C. B. Martin. U. T. Place, & T. Crane (Ed.) Dispositions: A debate (Chapter 4, pp. 49-67). Routledge.
Nominalised predicates, opaque contexts and monadic relational predicates are cases where surface structure conceals an underlying complexity. A conceptualist picture theory of meaning allows different ways of carving up reality into atomic situations. To say that a universal exists means either that it has at least one instance or that some creature has that concept. Structural factors combine to cause dispositions. Dispositions combine with the relevant conditions to cause their manifestations. Type-identities begin as contingent hypotheses and become necessary when used in classification. The existence of individual dispositional properties, not Laws of Nature, are the truthmakers for causal counterfactuals.
Download: 1996d Chapter 4 A Conceptualist Ontology.pdf