But baseball fans can’t be judged by any reasonable standard. We are obsessed by the minutiae of the game and nagged for the rest of our lives by the memory of players we once saw play. No item is therefore too trivial that puts us back in touch with them. I am just old enough to remember Burleigh Grimes and his well-moistened pitches sailing deceptively to the plate, and when I found his bark I studied it as intently as if I had come upon the Rosetta Stone. “So that’s how he did it,” I thought, peering at the odd botanical relic. “Slippery elm! I’ll be damned.”