YELLOW JESSAMINE (_Gelseminum Sempervirens_). The root is the part used. Through its controlling effect over the sympathetic nervous system, this agent exerts a marked influence in controlling morbid excitability of the circulatory organs. It allays irritation, and determination of blood to the brain, indicated by flushed face, contracted pupils, irritability, and restlessness, a frequent condition in diseases incident to childhood. Its concentrated principle, Gelsemin, is an efficient remedy in bloody-flux or dysentery. It should be administered in very small doses to secure the best results. Only one-sixteenth to one-eighth of a grain is required, repeated every two hours. It should be triturated with sugar of milk or with common white sugar, in the proportion of one grain to ten of sugar. _Dose_--Of tincture, from five to fifteen drops; of fluid extract, three to six drops; of Gelsemin, as a sedative, one-fourth to one-half grain. STIMULANTS. Stimulants are medicines which have the power of increasing the vital activity of the body. Some have a very transient action, while others are more permanent in effect. CAYENNE PEPPER (_Capsicum Annuum_). Cayenne Pepper is a powerful stimulant. _Dose_--Of the powder, from one to six grains, administered in milk; of the tincture, from five to ten drops, largely diluted in milk or water. BLACK PEPPER (_Piper Nigrum_). Black Pepper is a warm, carminative stimulant. _Dose_--From five to fifteen grains; of the fluid extract, from ten to fifteen drops. [Illustration: Fig. 138. Prickly-ash. ] PRICKLY-ASH (_Xanthoxylum Fraxineum)._ Prickly-ash bark is a stimulant and tonic. The parts used are the bark and leaves. _Dose_--Of the fluid extract, from five to fifteen drops; of the tincture, ten to twenty drops; of the active principle, Xanthoxylin, one to two grains. ALCOHOL is a powerful stimulant. It is never used in its pure state in medicine, but when diluted forms a useful remedy in many diseases. It is generally employed in the form of whiskey, gin, rum, brandy, and wine. AMMONIA is an excellent stimulant. _Dose_--Of the carbonate, from three to five grains; of the sesquicarbonate, from five to ten grains; this is the same as the carbonate, which has been exposed to the air and slacked (powdered hartshorn); of the aromatic spirit, from one-half to one teaspoonful. The Aqua Ammonia and Liquor Ammonia are of such variable strength that they are seldom employed internally, but may be applied externally and taken by inhalation.