Two delicious perfumes are distilled from the flowers--oil of neroli, and napha water,--of which the chemical hydro-carbon "hesperidin," is mainly the active principle. This is secreted also as an aromatic attribute of the leaves through their minute glands, causing them to emit a fragrant odour when bruised. A scented water is largely prepared in France from the flowers, _l'eau de fleur d'oranger_, which is frequently taken by ladies as a gentle sedative at night, when sufficiently diluted with sugared water. Thousands of gallons are drunk in this way every year. As a pleasant and safely effective help towards wooing sleep, from one to two teaspoonfuls of the French _Eau de fleur d'oranger_, if taken at bedtime in a teacupful of hot water, are to be highly commended for a nervous, or excitably wakeful person. Orange buds are picked green from the trees in the gardens of the Riviera, and when dried they retain the sweet smell of the flowers. A teaspoonful of these buds is ordered to be infused in a teacupful of quite hot water, and the liquid to be drunk shortly, before going to bed. The effect is to induce a refreshing sleep, without any subsequent headache or nausea. The dried berries may be had from an English druggist. [402] A peeled Orange contains, some citric acid, with citrate of potash; also albumen, cellulose, water, and about eight per cent. of sugar. The white lining pith of the peel possesses likewise the crystalline principle "hesperidin." Dr. Cullen showed that the acid juice of oranges, by uniting with the bile, diminishes the bitterness of that secretion; and hence it is that this fruit is of particular service in illnesses which arise from a redundancy of bile, chiefly in dark persons of a fibrous, or bilious temperament. But if the acids of the Orange are greater in quantity than can be properly corrected by the bile (as in persons with a small liver, and feeble digestive powers), they seem, by some prejudicial union with that liquid, to acquire a purgative quality, and to provoke diarrhoea, with colicky pains. The rind or peel of the Seville Orange is darker in colour, and more bitter of taste than that of the sweet China fruit. It affords a considerable quantity of fragrant, aromatic oil, which partakes of the characters exercised by the leaves and the flowers as affecting the nervous system. Pereira records the death of a child which resulted from eating the rind of a sweet China Orange.