Uses.--The rind of the _cagel_ is the so-called bitter orange peel, the best of which comes from Curaçao and Barbadoes. It is tonic and is used in decoction and in syrup. The infusion of the leaves, 5-10 grams to the liter, is useful as a sedative and diaphoretic in hysterical and nervous attacks; the infusion of the flowers is similarly used. When distilled the flowers yield a very sweet essential oil called _neroli_, which is used as a perfume only. Botanical Description.--A tree 15-20° high, trunk bearing solitary spines. Leaves medium lanceolate, serrate, the apex notched, petioles winged. Flowers usually solitary. Calyx 4-5-toothed. Corolla 4-5 petals. Filaments joined or separate. Anthers about 20. The fruit, a small orange 2' or more in diameter, the peel closely adherent. The _C. aurantium verum_ or _C. reticulata_ (Blanco) has a yellow pulp and the rind is readily separated from it, a thin net of fibers intervening. _Citrus decumana_, L. Nom. Vulg.--_Suha_, _Lukban_, Tag.; _Toronjas_ Penins.; _Naranjas_, Sp.-Fil. Uses.--The fruit, which is handsome and large, and the leaves and flowers, are used for the same purposes as those of _C. bigaradia_. Habitat.--The above species are cultivated in all parts of the islands, and, like the variety _C. aurantium verum_, H. f. (_C. reticulata_, Blanco), commonly called _naranjita_, are among the most abundant of native fruits. _Ægle decandra_, Naves. (_Feronia ternata_, Blanco.) Nom. Vulg.--_Malakabuyaw_, Tag.; _Tabog_, Pam., Tag. (A species of Bael-Fruit Tree.) Uses.--We do not know the medicinal use of this plant in the Philippines. Probably it has none, but we may give those of the species. _R. marmelos_, Cor., the fruit of which is almost identical with that of our species and is called _Bela_ or _Bael_ in India. The fruit of the Malakabuyaw is ovoid and full of a mucilaginous pulp, aromatic and acid, the same as that of the Bael. The uses of the latter are the following: The pulp acts as an astringent, but it would be more correctly called a tonic of the intestinal mucosa, for it has been experimentally proved that, although it checks diarrhoea, it also acts as a laxative in chronic constipation. In both conditions it seems to operate by toning and regulating the functions of the intestine. Martin, an English physician, was the first to call attention to the properties of Bael, and according to Dr. Green one dose of the pulp of the ripe fruit, prepared with sugar and given every morning, is an efficient remedy in the treatment of the dyspepsia of Europeans in India, especially in the form characterized by constipation and flatulence. The green fruit is a powerful astringent used by the Hindoos for diarrhoea. In cholera epidemics Dr. Bose advises the daily use of an ice made from the pulp of the ripe fruit, the object being the regulation of the functions of the intestine. The Pharmacopoeia of India contains the following preparations: