A few dashes of Angostura Bitters.
296.19 kilometres (184.05 miles)
There is no definitive answer in the research. However, it might be that the word gin in the name is a reference to the word Djin, a genie from the Arab world. It is known that the Victorian era used...
because Whitney's cousin was named Gin- Look it up!
2oz. of Gin and 5oz. Tonic. Garnish with Lemon or Lime wedge to suit your own taste