From Charles Baker's "Gentlemen's Companion" this is just gin and angostura bitters but says Baker, it was "such an important part of men's drinking lives in the colonies that we append it here." It can be prepared with either Old Tom or dry gin. The author also instructs that the drink be served at room temperature by lining a cocktail glass with 4-5 dashes of bitters, swirl and discard the extra then simply fill the glass with gin.
I took a (perhaps) more modern approach and stirred the ingredients over ice and strained it into a cocktail glass.
A great drink and quite refreshing when served chilled.
2.5 oz. old Tom or dry gin
4-5 dashes Angostura Bitters
Combine ingredients in a mixing glass ice. Stir and strain into a cocktails glass.