When Saint Ballado came to the farm, Duncan Taylor recalls Les Brinsfield telling him to try Mari's Book mares. "Mari's Book!" he exclaims now. "It's not like there were Mari's Book mares all around, out there in the population. But Les was a smart guy, very analytical." And it was easy to see the logic: Mari's Book was by Northern Dancer out of a Maribeau mare; and Maribeau, like Saint Ballado's sire Halo, was out of Cosmah--whose half-sister Natalma, of course, gave us the sire of Mari's Book. Plenty of...