Use small mixing glass, one lemon cut in two and one table-spoonful of powdered sugar.
Crush well with muddler; add
1 jigger of Tom gin
Shake well, strain into large thin glass and fill with bottle of Delatour soda.
Same as Tom Collins, except use Holland gin for John Collins; Scotch whisky for Scotch Collins and Irish whisky for Irish Collins in place of Tom gin.