Full Idea
If the natural kinds are divided into hierarchical categories, then essentialists would expect the laws of nature also to divide up into these categories, with the same hierarchy.
Clarification
A 'hierarchy' is a branched arrangement, with higher and lower groups
Gist of Idea
The laws of nature imitate the hierarchy of natural kinds
Source
Brian Ellis (The Philosophy of Nature: new essentialism [2002], Ch.5)
Book Reference
Ellis,Brian: 'The Philosophy of Nature: new essentialism' [Acumen 2002], p.85
A Reaction
This seems to me a real step forwards in our understanding of nature, and hence a nice example of the contribution which philosophy can make, instead of just physics.