The history of Ralston Purina Company is filled with twists and turns, and an occasional fork in the road. Our past is paved with vivid, often disparate images – from Brain Bread to dog litter, from Maud the Mule to the Energizer Bunny, from Purina Layena to Purina® Dog Chow® brand. The one thread throughout this curious evolution is the ability to adapt. The Darwinian Concept of biological survival applied to business is not new. Given World Wars, the Great Depression, intense competition, and enormous shifts in business and technology, business survival over time is no mean task.