This salt is the main source of the metalloid, and is especially abundant in the water of the Dead Sea; it is found also in the Ashby and Kreuznach waters.

Besides these, there are many metallic bromides, such as those of iron, zinc, mercury, and lead; and many organic bromides, such as those of camphor, morphia, quinine, and strychnia. Their properties are chiefly those of the base, but modified somewhat, so as to act more favorably on the nervous system. Bromhydric acid is another combination recently introduced (British Medical Journal, July, 1876) (v. p. 119). Hydrobromic ether is said to be an efficient and comparatively safe anaesthetic (Levin).