The discovery of this masterpiece Whistler's "e;Portrait of William Merritt Chase,"e; along with another important Whistler painting, "e;Harmony in Black, No10,"e; reveals exciting new discoveries on Whistler's artistic methods, from the Old Masters and the artistic truisms of the Renaissance. Documented analysis including x-ray examination, forensics and recognized paintings by Whistler's followers will confirm this portrait and "e;Harmony in Black, No10,"e; with x-ray revealing two lost paintings. These Whistler paintings connect scholarship and identify paintings worthy of merit and what makes a masterpiece a masterpiece.