Full Idea
The laws of a domain are the fundamental, general explanatory relationships between kinds, quantities, and qualities of that domain, that supervene upon the essential natures of those things.
Gist of Idea
Laws are explanatory relationships of things, which supervene on their essences
Source
Alexander Bird (Nature's Metaphysics [2007], 10.1)
Book Reference
Bird,Alexander: 'Nature's Metaphysics' [OUP 2007], p.208
A Reaction
This is the scientific essentialist view of laws [see entries there, in 'Laws of Nature']. There seems uncertainty between 'kinds' and 'qualities' (with 'quantities' looking like a category mistake). I vote, with Ellis, for natural kinds as the basis.