The enzymic production of acid in honey

An enzyme system producing acid in honey has been demonstrated. Examination of the acids removed by an anion‐exchange resin supports the findings of Nelson & Mottern (1931) that citric and malic acids are not responsible for the greater part of the acidity of honey, and evidence of the presence of keto‐acids has been obtained. A field test in which sugar syrup was fed to bees having no other food supply indicates that acid‐producing enzymes are introduced into the syrup by the bees.