# Has the “ Logic of relations” chapter disappeared from logic books ( since Russell's Principia)? ( Looking for modern references on this subject)

In Russell's Principles Of Mathematics and Principia, there was a chapter called " Logic of relations".

I cannot find such a chapter in modern logic books.

Could a reference having this chapter be indicated?

Does " logic of relations" have interesting particularities (1) from a semantic point of view? (2) from a syntactic point of view?

In particular, are there special natural deduction rules for relational statements?