Where does Tolkien talk about hybridization of humans and other beings, in "On Fairy Stories"?
I just re-read it, and can't find the spot.
Is it just a small mention, related to the Frog Prince or something?
I got the info from TVTropes's info on the essay, which says, or used to say:
Heinz Hybrid: He mentions this, and notes that it can lead to unimpressive results if overdone.
Where Heinz Hybrid is:
A hybrid of an implausible number of different species.