Jack's Manual by J. A. Grohusko (1910, p.74)

0.5 portiondry gin base
0.5 portionFrench vermouth — French Vermouthmodifier
5 dropsGreen Breton modifier
ice — broken iceother
  1. Stir the dry gin, French vermouth, Green Breton, and broken ice.
  2. Strain and serve.

Ice: Broken ice

See also: Parson's Cocktail, Randolph