*fangirls Philo for The Apple Tree* I love that novel. For a fic that strays so far from canon in some ways (magical theory and culture, etc.) it feels remarkably emotionally true and vivid. It's one I've downloaded to my Palm Pilot to reread whenever I get the urge. Oh, and I adore your Neville.
As for the fic at hand, I thought Harry might know also, because of the exact same two passages Philo pinpoints. I like the perspective that you don't necessarily know whether he does or not. :) I wonder whether Severus wonders if Harry might know...