Botanical Description.--An annual plant, .60-1 meter high. Root central with lateral rootlets. Stem straight, ramose. Leaves opposite, abruptly pinnate with a stylet in place of the odd leaflet. Leaflets, 5-6 pairs, the lower ones smaller, ovate, oblong, margins and lower face downy. Common petiole swollen at the base, 2 stipules and 1 glandule. Calyx, 5 unequal sepals. Corolla, 5 nearly equal petals, sulphur yellow, concave, the posterior one further developed. Two verticils of 5 stamens each. Of the 5 stamens superior to the sepals, 2 are fertile, larger and arched; of the other 5 stamens 4 are fertile and small. Pod compressed, linear, smooth, 5' long, containing many compressed, heart-shaped seeds, separated by thin partitions. Habitat.--Common in Luzon. Blooms in October. _Cassia alata_, L. Nom. Vulg.--_Acapulco_, Sp.-Fil.; _Katandá_, _Gamut sa Buni_, _Sonting_, Tag.; _Sunting, Kansitás_, Vis.; _Pakayomkom-kastila_, Pam. Uses.--This is one of the most popular Philippine remedies and its usefulness is vouched for by many physicians practicing in many different lands. Its antiherpetic properties are notable and the Tagalo name of the plant, "Gamut sa Buni," means literally "medicine for herpes." The natives use the juice of the leaf applied locally to the affected part. These properties have long been familiar to the Malays and to the Hindoos who in their medical works give the plant the Sanscrit name of "Dadrughna," meaning "to cure herpes." The Pharmacopoeia of Bengal recommends cassia in the form of an ointment made by mixing the crushed tender leaves with simple ointment. This preparation is, in our opinion, undesirable on account of its liability to become rancid and vaseline should be the excipient used. Another application for herpetic eruptions is the juice of the leaves mixed with an equal quantity of lemon juice. The Malays use the leaves dried in the sun, adding to them a little water and rubbing them briskly on the affected parts, the vigorous treatment being an important part of the cure. The decoction of the leaves is a laxative and according to Mr. J. Wood the tincture has an action similar to that of senna. Dr. Pulney Andy of India states that the extract prepared from the tender leaves is a good substitute for extract of colocynth. Mr. A. Porte claims to have obtained the best results with an acetic extract of the fresh leaves. The following is his formula: Fresh leaves of _C. alata_ 100 grams. Acetic acid diluted in 2/3 water 450 grams. Macerate 10 or 12 days, filter and express, then filter again and evaporate to the consistency of an extract. The seeds contain vermifuge principles. The activity of this plant in herpes is due to the chrysophanic acid contained in it. The more recent the eruption the more certain is the effect.