 This was distinguished from the Gin Fizz cocktail in that the 3 dashes of lemon juice in the Gin Fizz was "fizzed" with carbonated water to essentially form a "Gin and Sodawater" whereas the considerably more "juice of a small lemon" in the Tom Collins essentially formed a "Gin and Sparkling Lemonade" when sweetened with the gum syrup.The type of gin used by Thomas was not specified in his 1887 book, but was most likely Old Tom if that was responsible for the change in the drink's name.If, alternatively, the change in name was caused by the popularity of the Tom Collins Hoax of 1874 then it is more probable that Holland gin rather than English London Dry Gin was intended since Jerry Thomas' Gin Fizz (1887) called for Holland gin and Hollands Gin (Jenever) was imported into the United States at that time at a ratio of approximately 6 liters to every liter of English Old Tom Gin.