466 Proceedings of the Royal Physical Society. 
Delhi Boil, or Oriental Sore, or Biskra Button, 
or Afrwan Date-Mark. 
This disease begins by itching, usually of some surface on 
the exposed part of the body. A papule is then formed, 
which soon becomes pustular. The discharge from the 
pustule forms crusts, under which ulceration goes on. The 
sore lasts for about five or six months, leaving deep dark 
cicatrices, hence the name date-mark. It is inoculable, and 
occurs at all ages. It is not accompanied by pain or fever. 
It is usually single, but may appear in crops. Although it 
is certainly a specific affection, it is as yet impossible to 
determine its cause. It does not appear to be due to water, 
or to climate, or to eating fresh dates. Some believe (Carter) 
it is due to a mycelium arranged in open and angular meshes 
with conidia on its free ends, having subsequently bright 
orange-tinted particles arranged in spherical or ovoid groups, 
supposed to be a further stage of development. It is met 
with in horses and dogs. 
Preventive Treatment.—The use of pure filtered water, good 
food, absolute cleanliness of house, clothes, and person, 
avoidance of overcrowding, and contact with the disease in 
animals or human beings, with careful attention to sanitary 
surroundings, are the only means which can be suggested 
as prophylactic to the disease. The local treatment should 
be water-dressings, followed by linseed-meal or bread 
poultices; but when the ulcer is formed, a stringent lotion, 
such as sulphate of iron, carbolic acid, and iodine may be 
appled. If the patient suffer from malaria, quinine must be 
given. Ifa scorbutic taint is suspected, fresh vegetables and 
lime juice, or fresh lemon juice are advisable; or should a 
syphilitic taint be made out, small doses of mercury and iodide 
of potassium will be advisable. In all cases a tonic regimen 
should be followed. Change of air and of drinking water is 
most desirable, and a voyage home may be needful in obstinate 
cases. 
Dengue. 
Dengue may be described as a specific fever, characterised 
by a high temperature, a peculiar and distinctive rash, violent 
