Stir all ingredients except for seltzer with ice and strain into a bar glass. Fill with seltzer. "The original text simply says to make a whiskey sour large enough to half-fill a bar glass, fill the balance with seltzer and garnish with fruit. From the 1902 catalog of The Bishop & Babcock Company of Cleveland, Chicago, New York and St. Paul, a purveyor of beer equipment for bars." — MixologyTech for Martin’s Index of Cocktails and Mixed Drinks.