_Arabian Laughing Plant_.--In Palgrave's "Central and Eastern Arabia" some particulars are given in regard to a carious narcotic plant. Its seeds, in which the active principal seems chiefly to reside, when pounded and administered in a small dose, produce effects much like those ascribed to Sir Humphrey Davy's laughing gas; the patient dances, sings, and performs a thousand extravagances, till after an hour of great excitement to himself and amusement to the bystanders, he falls asleep, and on awaking has lost all memory of what he did or said while under the influence of the drug. To put a pinch of this powder into the coffee of some unexpecting individual is not an uncommon joke, nor is it said that it was ever followed by serious consequences, though an over quantity might perhaps be dangerous. The author tried it on two individuals, but in proportions if not absolutely homoeopathic, still sufficiently minute to keep on the safe side, and witnessed its operation, laughable enough but very harmless. The plant that hears these berries hardly attains in Kaseem the height of six inches above the ground, but in Oman were seen bushes of it three or four feet in growth, and wide-spreading. The stems are woody, and of a yellow tinge when barked; the leaf of a dark green color, and pinnated with about twenty leaflets on either side; the stalks smooth and shining; the flowers are yellow, and grow in tufts, the anthers numerous, the fruit is a capsule, stuffed with greenish padding, in which lie imbedded two or three black seeds, in size and shape much like French beans; their taste sweetish, but with a peculiar opiate flavor; the smell heavy and almost sickly.