MALT EXTRACT: a nutritious and invigorating beverage growing in public favor. So many varying qualities are offered, some of them differing little from ordinary beer or ale, that merchants are best guided by the reputations of the firms marketing them. True malt extract is a syrupy liquid obtained by the maceration and digestion of malt, generally barley malt, followed by filtration and concentration. It should contain from 70% to 80% residual extract, chiefly maltose, including about 2% diastase.