A Persian gum obtained from Dorema ammoniacum, an umbelliferous plant. A drug famous since ancient times. Proved and introduced by I. G. Jahnel in 1837, proved again by J. B. Buchner in 1840, and by several others in 1847. ^ Mind. Anxiety, with congestion of lungs. Low-spirited ; sluggish ; drowsy. Indisposed to mental work. Intellectual labor prevented by headache. ^ Sensorium. Aching in forehead with confusion of whole head, and such drowsiness that any effort or labor was impossible. Forehead confused, with weakness of sight and heaviness in loins. Confusion of the head and sleepiness, with a sensation as if bruised in the limbs, and pains in the course of the crural nerve. ^ Inner Head. Pains throughout the whole forehead ; increasing all day till evening, preventing intellectual labor. Severe headache continuing during the night, preventing