Full Idea
I should probably modify my view, and say that properties are individuated by their possible causes as well as by their possible effects.
Gist of Idea
Actually, properties are individuated by causes as well as effects
Source
Sydney Shoemaker (Causality and Properties [1980], §11)
Book Reference
Shoemaker,Sydney: 'Identity, Cause and Mind' [OUP 2003], p.233
A Reaction
(This is in an afterword responding to criticism by Richard Boyd) He doesn't use the word 'individuate' in the essay. That term always strikes me as smacking too much of epistemology, and not enough of ontology. Who cares how you individuate something?