It is said that the Manhattan cocktail was invented by Dr. Ian Marshall at a banquet for Lady Randolph Churchill held at The Manhattan club in New York city. During the 1940's and 1950's, one often served only martinis and Manhattans at one's cocktail parties. All I know is that the Manhattan cocktail is Sis' favorite, so we keep a gallon jug of these in the 'fridge!
"On the Rocks": Dash the bitters into the bottom of a highball glass. Pour in the whiskey and vermouth. Add the cherry, then 3 or 4 ice cubes. Top with a splash of seltzer.
"Straight Up": Place the cherry into a pre-chilled cocktail glass. In a cocktail mixer, dash the bitters, then add the whiskey and vermouth. Add 4 or 5 ice cubes. Stir 7 times. Strain into the cocktail glass, and top with a splash of seltzer.