Here’s a book that’s well named: “Bald.” To emphasize the point, the cover contains an illustration of a man in profile, his pate as smooth as stone, and a back flap front-face photo that shows one hairless Simon Critchley, professor of philosophy, looking a bit perturbed. But not because he’s bald. Critchley announces the fact as his opening sentence: “I’m bald.” The condition started when he was 19 and then, he says, “like the Roman Empire, my hair went into a long and irreversible decline and fall.”