Gin and tonic with Hendrick's Gin is typically garnished with a slice of cucumber. However, garnishes of cucumber are very rare, and garnishes of orange are rarer still. The cocktail was introduced by the army of the British East India Company in India. In India and other tropical regions, malaria was a persistent problem. In the 1700s it was discovered by Scottish doctor George Cleghorn that quinine could be used to prevent and treat the disease. The quinine was drunk in tonic water, however the bitter taste was unpleasant. British officers in India in the early 19th century took to adding a mixture
History of malaria Dmitri Leonidovich Romanowsky independently developed techniques using a mixture of Eosin Y and modified methylene blue (methylene azure) that produced a surprising hue unattributable to either staining component: a shade of purple. Malachowski used alkali-treated methylene blue solutions and Romanowsky used methylene blue solutions which were molded or aged. This new method differentiated blood cells and demonstrated the nuclei of malarial parasites. Malachowski's staining technique was one of the most significant technical advances in the history of malaria. In 1891, Paul Guttmann and Ehrlich noted that methylene blue had a high affinity for some tissues and that this dye had