This section is from the book "A Treatise On Beverages or The Complete Practical Bottler", by Charles Herman Sulz. Also available from Amazon: A Treatise On Beverages.
It crystallizes in anhydrous cubes or octahedrons, having a saline taste and melting at a red heat, and is freely soluble in alcohol and in spirit of ether. Exposed to the atmosphere, it forms prisms or needles containing 2 H3O, and then deliquesces; at 0° 0. (32° F.) it requires 1.6 parts, at 20° C. (68° F.) 1.24 parts, and at 100° C. (212° F.) 0.77 part of water for solution.