Evaporated, converted into vapor and dissipated.
What is Marine Salt?
That which is made from sea-water, concentrated by repeated evaporations, and at length crystallized.
What is Spring Salt?
That salt which is not made from sea-water, but from the water of salt wells or springs; large quantities of this salt are made in the United States, in some parts of which saline springs are numerous.
In what manner is it obtained?
The means employed for extracting the salt from the water vary according to circumstances. In hot countries, the water is merely exposed to the action of the sun, until the water is evaporated; the salt procured in this manner is considered the best.
What method is usually employed in countries where the sun's heat is not sufficiently powerful?
In climates where the rays of the sun do not afford sufficient heat, the water, which has been partly evaporated in large shallow reservoirs formed in the earth, called salt-pans, is poured into enormous coppers and boiled for four or five hours: when the contents of the copper are wasted to half the quantity, the liquid begins to be crystallized; the vessel is again filled up, and the brine again boiled and purified: this is repeated three or four times. After the last purifying the fire is kept very low for twelve or fourteen hours, and when the moisture is nearly evaporated the salt is removed, and, after the remaining brine has drained off, is placed in the store-houses.