icacious to moisten the eye than solutions of lead. Tincture of
opium diluted. New vessels from the inflamed tunica adnata frequently
spread like a fly's wing upon the transparent cornea, which is then called
Pterigium. To stop the growth of this, the principal vessels should be cut
through with a lancet. When the inflammation begins to decline, after due
evacuation any stimulating material put into the eye increases the
absorption, which soon removes the new red vessels; which has given rise to
a hundred famous eye-waters, and eye-doctors; if these stimulating
materials are used too soon, the inflammation is increased by them. See
Sect. XXXII. 2. 10.

There is another ophthalmia, which attends weak children, and is generally
esteemed a symptom of scrophula, as described in Class II. 1. 4. 1. and
another, which is of venereal origin, mentioned in Class II. 1. 5. 2. both
which may be termed ophthalmia superficialis.

3. _Phrenitis._ Inflammation of the brain is attended with intolerance of
light and sound; which shews, that the extremities of the nerves of those
senses are at the same time inflamed; it is also attended with great pain
of the head, with watchfulness, and furious delirium. The violent efforts,
these patients are said sometimes to exert, are owing to the increased
secretion of sensorial power in the brain; as all other inflamed glands
have a greater circulation of blood passing through them, and a greater
secretion in consequence of their peculiar fluids, as in the hepatitis much
more bile is generated.

M. M. Venesection. Cathartics. Torpentia. Foment the head with cold water
for hours together. Or with warm water. Cool airy room. Afterwards cupping
on the occiput. Leeches to the temples. When the patient is weakened a
blister on the head, and after further exhaustion five or six drops of
tincture of opium.

4. _Peripneumonia._ Inflammation of the lungs. The pulse is not always
hard, sometimes soft; which is probably owing to a degree of sickness or
inaction of the stomach; with dull pain of the chest; respiration
constantly difficult, sometimes with erect posture; the face bloated and
purplish; cough generally with moist expectoration, often stained with
blood.

When the difficulty of respiration is very great, the patient is not able
to cough; in this situation, after copious bleeding, the cough is liable to
return, and is so far a favourable symptom, as it shews some abatement of
the inflammation.