During his "Chowder Summer," David Norton Stone spent a season doing what many of us only dream of: eating clam chowder at every available opportunity. In this final book in the Rhode Island Quahog series that began with Clamcake Summer and Stuffie Summer, Stone serves up a few bowls of history, quarts of the chowder he enjoyed around Rhode Island, Manhattan and New England, as well as a few oyster crackers of humor.