ars old.
The incubation period is from ten to fifteen days; there are practically
no prodromal symptoms, the only indication being a slight amount of
fever for some twenty-four hours, after which the eruption makes its
appearance. A number of raised red papules appear on the trunk, either
on the back or chest; in from twelve to twenty-four hours these develop
into tense vesicles filled with a clear fluid, which in another
thirty-six hours or so becomes opalescent. During the fourth day these
vesicles dry and shrivel up, and the scabs fall off, leaving as a rule
no scar. Fresh spots appear during the first three days, so that at the
end of that time they can be seen in all stages of growth and decay. The
eruption is most marked on the chest, but it also occurs on the face and
limbs, and on the mucous membrane of the mouth and palate. The
temperature begins to fall after the appearance of the rash, but a
certain slight amount may persist after the disappearance of all
symptoms. It rarely rises above 102 F. The disease runs a very
favourable course in the majority of cases, and after effects are rare.
One attack does not confer immunity, and in numerous cases one
individual has had three attacks. The diet should be light, and the
patient should be prevented from scratching the spots, which would lead
to ulceration and scarring. After the first few days there is no
necessity to confine the patient to bed. In the large majority of cases,
it is easy to distinguish the disease from smallpox, but in certain
patients it is very difficult. The chief points in the differential
diagnosis are as follows. (1) In chicken-pox the rash is distributed
chiefly on the trunk, and less on the limbs. (2) Some of the vesicles
are oval, whereas in smallpox they are always hemispherical. They are
also more superficial, and have not at the outset the hard shotty
feeling of the more virulent disease. (3) The vesicles attain their full
growth within twelve to twenty-four hours. (4) The pustules are usually
monocular. (5) There is no prodromal period.

CHICLANA, or CHICLANA DE LA FRONTERA, a town of southern Spain, in the
province of Cadiz, 12 m. by rail S.E. of Cadiz. Pop. (1900) 10,868.
Chiclana occupies a fertile valley, watered by the river Lirio, and
sheltered, on the north and south, by low hills covered with vines and
plantations. It faces the gulf of Cadiz, 3 m. W., and, from its mild
climate and pleasant surroundings, is the favourite