> Do you practice this?

Not exactly. I try to maintain as many lines as I can. What I choose when grafting, though, are the more booming hives. But I only replace the lines I think are inferior. In other words the ones that languish or really go slow. I don't requeen all my hives with sisters from my most outstanding mother.

> Where does Brother Adam mention this? I have read most of his books and cant recall reading it.

I don't have my library handy (as I'm in the process of moving) but I'm fairly sure it was in "In search of the Best Strains of Bees". Seems like it was somewhere between 1/4 of the way and 1/3 of the way into the book.

> Where does Miller mention it?

C.C. Miller doesn't do it or recommend it, but mentions it:

http://www.bushfarms.com/beesmillerm...nceofselection

2nd paragraph down from "Importance of Selection"