Greenish-yellow transparent liquid, with a disagreeable pungent odour. S.G. 0.999.

Preparation. - Saturate a solution of ammonia by sulphuretted hydrogen.

Dose. - 3 minims, cautiously increased.

Actions. - In small doses it increases secretion, especially of bronchi and skin, and is thus used as a sudorific and expectorant in chronic skin-diseases, rheumatism, and bronchitis; in large doses it causes giddiness, drowsiness, faintness, and nausea. Little given.

It is chiefly used as a test.