by Barbara Waldinger A middle-aged Englishwoman, identified only as Homebody, tries in vain to remember the name of her anti-depressant:  “a portmanteau chemical cocktail word confected by punning psychopharmacologists.”  She imagines her “brain floating in a salt bath, frosted with a rime of salt, a pickle-brine brain, pink-beige walnut-wrinkled nutmeat…