nsist of ipecacuanha, camomile, antimony,
copper, zinc, and several others.

730. Ipecacuanha

Ipecacuanha is an emetic, diaphoretic, and expectorant.

It is _used internally_ to excite vomiting, in doses of from ten to
twenty grains of the powder, or one to one and a half ounce of the
infusion, every half hour until vomiting takes place. To make it act
well and easily, the patient should drink half pints of warm water
after each dose of the infusion. As a diaphoretic, it should be given
in doses of three grains, mixed with some soft substance, such as
crumbs of bread, and repeated every four hours.

_Dose_ of the _wine,_ from twenty minims to one drachm as a
diaphoretic, and from one drachm to one and a half ounces as an
emetic.

_Caution._--Do not give more than the doses named above, because,
although a safe emetic, yet it is an acrid narcotic poison.

731. Mustard

Mustard is too well known to require describing. It is an emetic,
diuretic, stimulant, and rubefacient.

It is _used externally_ as a poultice. Mustard poultices are made of
the powder, bread crumbs, and water; or of one part of mustard to two
of flour; or, especially for children, of linseed meal, mixed with a
little of the powder, or having some of the powder slightly sprinkled
on the surface. Sometimes a little vinegar is added under the idea
that it increases the strength of the poultice, but this is not
necessary. In all cases where a stimulant is required, such as sore
throats, rheumatic pains in the joints, cholera, cramps in the
extremities, diarrhoea, and many other diseases. When applied it
should not he left on too long, as it is apt to cause ulceration of
the part. From ten to thirty minutes is quite long enough.

When _used internally_ as an emetic, a large teaspoonful mixed with a
tumbler of warm water generally operates quickly and safely,
frequently when other emetics have failed. In dropsy it is sometimes
given in the form of whey, which is made by boiling half an ounce of
the bruised seeds in a pint of milk, and straining off the curd.

From three to four ounces of this is to be taken for a dose three
times a day.

732. Cathartics.

Cathartics are divided into laxatives and purgatives. Manna,
tamarinds, castor oil, sulphur, and magnesia are _laxatives;_ senna,
rhubarb, jalap, colocynth, buckthorn, aloes, cream of tartar,
scammony, calomel, E