A name for saltpetre; called by chemists nitrate of potassium. It is a cooling, sedative salt, when taken internally. In ten-grain doses it is a useful medicine in acute bronchial inflammation (bronchitis), and might be added with advantage, more often than it is, to cough-mixtures of the loosening kind.

Sweet Spirit of Nitre {spirit of nitrous ether) is a liquid preparation, whose properties are gently stimulating, diaphoretic, diuretic, and composing to the nerves. It has long been one of the most popular of domestic medicines for fever. It does the most good, however, in the least inflammatory conditions, and, when fever is high, its dose should not be large. Half a teaspoonful of it in a tumblerful of cold water, drunk, a little at a time, as thirst prompts, through the night, will be more likely to relieve a hot fever, with the coming of perspiration, than a whole teaspoonful taken at once. This is because the large doses" stimulate the circulation above the secreting point," to use an old but true medical phrase.

To increase the action of the kidneys, as a diuretic, sweet spirit of nitre is very often useful. For this purpose, in the absence of high fever, larger doses will suit than when that condition is present. From half a tea-spoonful to a teaspoonful, well diluted with water, will be a diuretic dose for an adult; to be repeated in a few hours, if needful.

Nitrite of Amyl is a powerful agent, used by inhalation, from one to four or five drops only at a time, as a remedy for the attacks or paroxysms of angina pectoris. It commonly causes immediate flushing of the face. If used, it should be as soon as the attack (with distress and pain about the heart, and along the left arm) begins.