esection by leeches on the temple, or
cutting the temporal artery, and one purge with three or four grains of
calomel should be premised. Then the Peruvian bark twice a day. Opium from
a quarter to half a grain twice a day for some weeks. Bathe the eye
frequently with cold water alone, or with cold water, to a pint of which is
added half an ounce of salt. White vitriol six grains dissolved in one
ounce of water; a drop or two to be put between the eyelids twice a day.
Take very small electric sparks from the eyes every day for a fortnight.
Bathe the whole head with salt and water made warm every night for some
months. Send such children to a school near the sea for the convenience of
sea-bathing for many months annually; such schools are to be found in or
near Liverpool.

When a child is afflicted with an inflamed eye of this kind, he should
always sit with his back to the window or candle; but it is generally not
necessary to cover it, or if the uneasy sensation of light makes this
proper, the cover should stand off from the eye, so as not much to exclude
the cool air from it. As covering an eye unnecessarily is liable to make
that eye weaker than the other, from its not being sufficiently used, and
thence to produce a squinting for ever afterwards.

Nevertheless, when the pain is great, a poultice must be applied to keep
the eyes moist, or a piece of oiled silk bound lightly over them. Or thus,
boil an egg till it is hard, cut it longitudinally into two hemispheres,
take out the yolk, sew the backs of the two hollow hemispheres of the white
to a ribbon, and bind them over the eyes every night on going to bed;
which, if nicely fitted on, will keep the eyes moist without any
disagreeable pressure. See Class I. 1. 3. 14.

_Ophthalmia equina._ An inflammation of this kind is liable to affect the
eyes of horses; one cause of which is owing to a silly custom of cutting
the hair out of horses' ears; by which they are not only liable to take
cold at the ear, but grass seeds are liable to fall into their ears from
the high racks in stables; and in both cases the eye becomes inflamed by
sympathy. I once directed the temporal artery of a horse to be opened, who
had frequent returns of an inflamed eye; and I believed it was of essential
service to him; it is probable that the artery was afterwards contracted in
the wounded part, and that thence less blood was derived to the eye: the
haemorrhage was stopped by two persons alterna