The William Wrigley Jr. Company was founded on April 1, 1891 originally selling products such as soap and baking powder. In 1892, William Wrigley, Jr., the company's founder, began offering chewing gum with each can of baking powder. The chewing gum eventually became more popular than the baking powder itself and Wrigley's reoriented the company to produce the popular chewing gum.
Is that when he mailed the gum or made it public...one of those, I can't remember which...sorry! ENJOY!