Wart
2 of the 7 encyclopedias on this shelf carry an entry for Wart. Both are reproduced below, so you can see where they agree and where they differ.
Aiton's Encyclopedia (1910)
Important: Safety Warning This page gives first-aid or emergency advice that predates modern medicine and can make an emergency worse. Do not follow it. In any medical emergency, call emergency services and follow current first-aid guidance. This information has been left in for historical purposes but should not be acted upon. a button-like projection of the skin consisting largely of a bunch of projecting papillae. Common warts come and go, especially on one's hands, in a capricious way that surgeons have been unable to explain. Warts are not confined to people. The homely wart-hog of Africa has repulsive warts on its face. "Warty as a toad" is an everyday expression. Boys frequently have an ill-founded notion that warts are likely to come from handling a toad. Other odd notions are connected with warts, one, that the juice of milkweeds cures warts, and another that it causes them. If a wart is of suitable shape, it may be removed by tying a succession of small, hard strings around it tightly at intervals of a day or two, each string being tied tighter than the last, until the wart is starved out by choking, and dries up and falls off. A short rubber band wound around a wart several times will have the same result. A salve of acetic acid, which is much the same as highly concentrated vinegar, applied with a camel's hair brush to the tip of the wart a few times, will kill it off. Other remedies are nitrate of silver and tincture of iron. A malignant wart should be let alone until a surgeon's advice may be had.
Collier's New Encyclopedia (1921)
known in surgery by the Latin name Verrucæ, a collection of lengthened papillæ of the skin, closely adherent and ensheathed by a thick covering of hard-dry cuticle. From friction and exposure to the air the surface presents a horny texture, and is rounded off into a small button-like shape. Such is the description of the simple wart, which is so commonly seen on the hands and fingers (and rarely on the face or elsewhere) of persons of all ages, but especially of children. Among other varieties of warts are (1) one to which the term Verruca digitata has been applied. It is more elongated in shape, and less protected by cuticle than the preceding. It is said to occur nowhere but on the scalp of women of adult age, and sometimes to occasion great annoyance in brushing and combing the hair. (2) Subungual warts, growing, as their specific name implies, beneath or at the side of the finger or toe nails. They originate beneath the nail, and as they increase they crop out either at the free extremity or the side of the nail, and are usually troublesome, and often very painful. They are generally of syphilitic origin. (3) Venereal warts, caused by the direct irritation of the discharges of gonorrhea or syphilis, and occurring about the parts which are liable to be polluted with such discharges. They attain a larger size, and are more fleshy and vascular than other warts.