Until the 1840s, most Bohemian beers were top-fermented, dark and cloudy. The taste and standards of quality often varied to the worse, and in 1838, consumers even dumped whole barrels to show their dissatisfaction. The citizens of Pilsen decided in 1839 to found and build a brewery of their own, called Bürger Brauerei (Citizens' Brewery) [1] [2] (now Plzeňský Prazdroj), which should brew beer according to the Bavarian style of brewing. Bavarian brewers had begun experiments with the storage (German: Lager) of beer in cool caves using bottom-fermenting yeasts, which improved the beer's clarity, flavor, and shelf-life. Most of this research benefited from the knowledge already expounded on in a German book (printed since 1794, in Czech since 1801), written by František Ondřej Poupě (1753–18