When an inflammation has caused an ex-travacation of the blood, it sometimes turns into a purulent substance, and forms an abscess or imposthume, which is nothing else but a great collection of purulent matter in some particular part. These abscesses vary according to the parts in which they are seated, and particularly as they are either external or internal; and which are to be distin-guished by some peculiar signs. In general, all large abscesses, in whatever part they are concealed, are attended with a flow quotidian fever, with a remission and exacerbation, a weak quick pulse, which soon impairs the strength and preys upon the juices : hence proceed nocturnal sweats, and a universal decay of the whole body.

Sometimes an imposthume lies hid between the peritonaeum and the muscles of the abdomen, and is known by a fixt pain, and a hard tumour, remaining there a long while, which may be often brought to a head by an emollient cataplasm. Sometimes a pleurisy, an inflammation of the lungs, a grievous fall, the measles or small pox, will leave an abscess in the thorax or chest, attended with an obtuse pressing pain, an inexpressible anxiety, a difficulty of breathing, a cough in the night, a quick languid pulse, a falling away of the body, particularly of the parts about the breasts, and the patient cannot bear to lie on the well fide. When the vessels break, and the matter falls upon the diaphragm, it is called an Empyema; which is attended with an intolerable pain near the loins. But it must be observed that all inflammations of the lungs or pleura, are followed by an adhesion of those parts: for which reason it is common for abscesses of the pleura and intercostal muscles to break outwardly, and is not uncommon for the lungs to do the same. In this cafe, the tumour must be opened with a lancet, when the pus is formed; and if the discharge is plentiful and constant, that the ulcer will not admit healing, it must be kept open with an hollow tent.

While the purulent matter is contained in a bag, it is called a Vomica; and then there is a fixt lasting compressing pain in the breast, with a quick pulse, a dry cough, a stinking breath, a falling away, a loss of strength, a want of appetite, and a debilitating sweat. When this Vomica breaks, the patient will sometimes cough up a plenty of matter.

An abscess in the mesentery, or membrane that ties the guts together, is attended with a weight, without any great pain or tumour, a slow fever, frequent fainting, with a cold sweat. Sometimes the purulent matter is voided by stool. Sometimes the abscess breaks into the cavity of the abdomen, and produces intolerable pains, and other horrid symptoms, particularly a fever, a tumour, and a constant urging to make water. An abscess in the back, between the peritonaeum and the psoas muscle, has the symptoms common to abscesses, together with a burning, fixt, heavy pain of the loins; as also a tumour, and the urine small in quantity full of filaments and threads, attended with a strangury. The kidneys are likewise subject to abscesses, which consume their whole substance, except a bag. In this cafe there is bloody urine, or it is mixt with purulent matter, and looks milky, which settles to the bottom, and has a strong smell. Sometimes the bladder is corroded by it with intolerable pain. Neither is the head free from abscesses, which in infants happens behind the ears, when the running is stopt with intolerable pain, a fever and a delirium. Sometimes an abscess lies hid between the cavities of the bones of the forehead, with a most intense pain in the forehead, and about the root of the nose, drawing the whole head into consent. When some spoonfuls of a yellow fetid matter drops from the nose, or is drawn off by a proper errhine, the pain will cease.

These abscesses differ greatly from ulcers, for the former are in the fleshy parts, and contain pure white concocted matter; whereas ulcers attack the cold dry membranaceous part?, and pour out a little fetid ichor, and depraved ferum. The cure of internal abscesses, in general, is too much out of the reach of medicine: nevertheless, they may be absorbed, or translated to parts within reach, par ticularly the legs, which has often been the case in these disorders of the breast.