Greyhound (cocktail) similar cocktail with the name "Greyhound" appears in Harper's magazine in 1945 (volume 191, page 461) thus: ""The cocktails were made of vodka, sugar, and canned grapefruit juice -- a greyhound. This cocktail was served at Greyhound's popular restaurant chain that was located at bus terminals, called 'Post House'."" Before 1945, vodka was an uncommon spirit and most drinks we think of today as "classic cocktails" and which call for vodka, originally would have contained gin. As vodka's popularity grew after the War and gin's popularity waned, many of the popular cocktails persisted, albeit with vodka substituted for gin. The
Oxygen cocktail of filling the cocktails with oxygen have been improved. Juices (grape, cherry, raspberry, etc.), syrups, water, milk and fruit-drinks are often used as the base of the cocktail. Oily and sparkling liquids result in poor homogeneity of the foam. The base liquid might contain extracts of plants and herbs such as hawthorn, strawflower, motherwort and rose hip, which themselves are used in the clinical practices. An essential element of the oxygen cocktail is the foaming agent, such as gelatin egg white or liquorice. Initially, oxygen cocktails were made with egg white. However clinical trials proved that this ingredient resulted in