An acid obtained from the juice of lemons, although it is also contained in various other fruits and vegetables. The usual method of preparing it consists in saturating a quantity of the juice of lemons by chalk, which thus forms citrate of lime, and afterwards decomposing the citrate by diluted sulphuric acid, by which means sulphate of lime is formed, and the citric acid is set free, and in this state it is used by the calico printers; but for other purposes it is crystallized by evaporation. There is an interesting paper on this subject in Parkes's Chemical Essays,