Full Idea
Essentialists believe elementary causal relations involve necessary connections between events, namely between the displays of dispositional properties and the circumstances that give rise to them.
Gist of Idea
Essentialists believe causation is necessary, resulting from dispositions and circumstances
Source
Brian Ellis (The Philosophy of Nature: new essentialism [2002], Ch.4)
Book Reference
Ellis,Brian: 'The Philosophy of Nature: new essentialism' [Acumen 2002], p.59
A Reaction
I like essentialism, but I feel a Humean caution about talk of 'natural necessity'. Let's just say that causation seems to be entirely the result of the nature of how things are. How things could be is a large topic for little mites like us.