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When it hits the cold air, a mineral called Glauber’s salt, or mirabilite, separates out.

Thus he clearly described the preparation of hydrochloric acid by the action of oil of vitriol on common salt, the manifold virtues of sodium sulphate—sal mirabile, Glauber’s salt—formed in the process being one of the chief themes of his Miraculum mundi; and he noticed that nitric acid was formed when nitre was substituted for the common salt.

GLAUBER’S SALT, decahydrated sodium sulphate, Na2SO4, 10H2O.

Glauber’s salt readily forms supersaturated solutions, in which crystallization takes place suddenly when a crystal of the salt is thrown in; the same effect is obtained by exposure to the air or by touching the solution with a glass rod.

Then, if the disease be of recent date, bleed the animal largely from the jugular vein, and give it several doses of Epsom, or Glauber's salt.