Dan Conlin has kept track of the trick-or-treaters who called at his Duncan St., Halifax, home for the last 17 years. Yesterday's numbers showed a modest uptick, but the overall trend is dramatic and downward: This year's visitors began arriving at 5:35 pm, peaked at 7 p.m., and had vanished into the night by 8:15. Vampires, Princesses, and Ninjas led the parade, at six each. Only one cat made an appearance, likely the one pictured, feline fancier Rosa Eileen Barss Donham, who lives one street over from Dan. Conlin gives his Best Overall Costume Award to an eight-year-old walking box of Ritz Crackers, English in...