Granula
Granula was popular and was sold through mail order catalogs and health food stores, but it was not popular for a long time because of its hard texture and the fact that it required soaking before it could be eaten. In 1877, a similar cereal called Grape-Nuts was introduced, which was made from wheat and barley flour and had a less hard texture. Grape-Nuts quickly became more popular than Granula and eventually replaced it as the msot popular breakfast cereal in the United States.