Book excerpt: Carroll's Island is one of many places along the Chesapeake Bay where vibrant stories of dogs, decoys, guns and waterfowl resonate up from the shoreline. The stories from Carroll's Island Ducking Club, which was founded in the mid-nineteenth century, offer special insights about the Chesapeake Bay's waterfowling heritage. In this warm, informative book, C. John Sullivan Jr., one of the nation's