The Imperial Embrocation company of Montreal had an advertisement for its remedy which included a recommendation by
Leslie R. Dowker. This tells us something about Leslie. It means that he must have been widely known as a respected and trusted person otherwise the company would not have tried to associate him with their brand.
Leslie featured in an Ad. for Imperial Embrocation, source: The Sherbrooke Examiner, Dec. 30, 1898, the Ad was published over several month.