Pour off the mother-liquor, evaporate to one third, and set aside, that more crystals may form.
The mother-liquor of the crystallisers is pumped back into the evaporating pans for further concentration.
More crystals may be obtained by evaporating the mother-liquor.
These were separated, and the mother-liquor on standing deposited some oblong rectangular crystals.
More crystals may be obtained by again evaporating the mother-liquor.
Considerable quantities of iodine are now obtained from the mother-liquor of Chilian saltpetre or nitre (nitrate of soda).
In 30 or 40 hours, or longer, the mother-liquor is run or pumped off.
This rough Epsoms, or sulphate of magnesia, is the crystals thrown down by the mother-liquor after a second boiling.
The salt so separating may be either anhydrous or a "hydrate" of greater concentration than the mother-liquor.
They seek to find, as it were, the mother-liquor of the great ocean, so as to express the truth in a crystal.