from The U. K. B. G. Guide to Drinks
The Dry Martini has developed from this recipe until today, in England, the recipe is generally accepted as 2/3 Dry Gin, 1/3 Dry Vermouth with a dash of orange bitters and a twist of lemon peel added. In America the trend for the Dry Martini to become drier has developed almost to a fad and the quantity of Dry Gin to Dry Vermouth varies from 3 to 1 to 6 to 1