Full Idea
The concepts of power, capacity and the nature of a particular involve generalisations and hence already presuppose that there are grounds for extrapolation.
Gist of Idea
The very concepts of a particular power or nature imply the possibility of being generalised
Source
Harré,R./Madden,E.H. (Causal Powers [1975], 8.V)
Book Reference
Harré,R/Madden,E.H.: 'Causal Powers: A Theory of Natural Necessity' [Blackwell 1975], p.151
A Reaction
I take sortal essentialism to be a serious misundertanding, but the mistake needs to be explained, and this idea is helpful towards that. I think the problem resides in the nature of the language we need to describe particulars.