Even surgeons thought it a necessary part of the process of healing, and the approving term "laudable pus" was applied to a soft, creamy discharge, without either offensive odor or tinge of blood, upon the surfaces of the healing wound; and the hospital records of that day noted with satisfaction that, after an operation, "suppuration was established." So strongly was this idea intrenched, that a free discharge or outpouring of some sort was necessary to the proper healing of the wound, that in the Middle Ages it was regarded as exceedingly dangerous to permit wounds to close too quickly. Wounds that had partially united were actually torn apart, and liquids like oil and wine and strong acids, which tended to keep them from closing and to set up suppuration, were actually poured into them; and in some instances their sides were actually burned with hot irons. There was a solid basis of reason underlying even these extraordinary methods, viz., the "rule of thumb" observation, handed down from one generation to another, that wounds that discharged freely and "sweetly," while they were slow in healing and left disfiguring scars, usually did not give rise to serious or fatal attacks of blood-poison or wound-fever. And of two evils they chose the less. Plenty of pus and a big ugly scar in preference to an attack of dangerous blood-poisoning. Even if it didn't kill you, it might easily cripple you for life by involving a joint. The trouble was with their logic, or rather with their premises. They were firmly convinced that the danger came from within, that there was a sort of morbid humor which must be allowed to escape, or it would be dammed up in the system with disastrous results.
One day a brilliant skeptic by the name of Lister (who is still living) took it into his head that perhaps the fathers of surgery and their generations of imitators might have been wrong. He tried the experiment, shut germs out of his wounds, and behold, antiseptic surgery, with all its magnificent line of triumphs, was born!
Now a single drop of pus in an operation wound is as deep a disgrace as a bedbug on the pillow of a model housekeeper, and calls for as vigorous an overhauling of equipment, from cellar to skylight; while a second drop means a commission of inquiry and a drumhead court-martial. This is the secret of the advances of modern surgery,--not that our surgeons are any more skillful with the knife, but that they can enter cavities like those of the skull, the spinal cord, the abdomen, and the chest, remove what is necessary, and get out again with almost perfect safety; whereas these cavities were absolutely forbidden ground to their forefathers, on account of the twenty, forty, yes, seventy per cent death risk from suppuration and blood-poison.