FIELD OF THIRTEEN

FIELD OF THIRTEEN Dick Francis (Putnam, $24.95) This mesmerizing collection of short stories shows the literary jockey at the top of his game. Employing the best monikers since Dickens (Tricksy Wilcox, who ''had brought unemployment to a fine art''; pickpocket Blisters Schultz; auctioneer Peregrine Vine) along with galloping plots and O. Henry endings, Francis handles the short form with ease, allowing him to focus his plots with a keen eye and more surely home in on his mostly sleazy characters. Whether it's an elegy for a sportswriter on the skids or the ballad of a Welsh groom and her social-climbing daughter, the stories linger long after you turn the page. A