Full Idea
There is a prima facie case for saying that the immutability of the causal potentialities of a property implies their essentiality. ...If they cannot vary across time, they also cannot vary across possible worlds.
Gist of Idea
It looks as if the immutability of the powers of a property imply essentiality
Source
Sydney Shoemaker (Causality and Properties [1980], §05)
Book Reference
Shoemaker,Sydney: 'Identity, Cause and Mind' [OUP 2003], p.217
A Reaction
This is only the beginning of scientific essentialism, but one of the targets is to save the phenomena. It is also involves unimaginability (of different powers from a given property) implying necessity.