Jim Waddick objected to my use of the word hybrid to describe "a cross between 2 genetic lines" - in contrast to his preferred usage, a cross between two species. In fact, the word has had the meaning I used (the progeny of parents which are members of the same species but differ in some detail) for over two thousand years. The Romans called the offspring of, for instance, a Roman citizen and a foreigner "hybrida". It might be argued that the word originally had a meaning closer to "mongrel" than to the modern inter-species concept. Jim McKenney Montgomery County, Maryland, USA, USDA zone 7, where the only things I'm crossing now are my fingers: thunderstorms are on the way and I've got things to finish outside before they arrive.