thank you; I'll read them both when the Pageant is over (*** ducks to avoid eggs being thrown in my direction by Shadrach ***I had to look online just to understand the meaning of addled. Most information I found relate to wild birds conservation, and they do make a difference between addled and infertile eggs. Some reasons I saw mentioned were shaking the egg, bad genetics, deliberately oiling the eggs (as birth control), a little hole in it.
If you're very motivated you could read this. Or this for a lighter historical read though not exactly on the same subject.
