Full Idea
It cannot be said that all intrinsic properties are perfectly natural, ...but it can plausibly be said that all perfectly natural properties are intrinsic.
Gist of Idea
All of the natural properties are included among the intrinsic properties
Source
David Lewis (On the Plurality of Worlds [1986], 1.5)
Book Reference
Lewis,David: 'On the Plurality of Worlds' [Blackwell 2001], p.61
A Reaction
Idea 15742 give the example he uses to support this claim. I like the concept of 'intrinsic' properties, but cannot currently see any use for the concept of 'natural' ones.
Related Idea
Idea 15742 A disjunctive property can be unnatural, but intrinsic if its disjuncts are intrinsic [Lewis]