Black Hellebore

The root is used as an irritating seton for cattle, and introduced into fistulous sores of the horse.

Spotted Hemlock

A narcotic poison. In doses of a drachm of the powdered leaves, or of the extract, gradually increased, it is sometimes given to quiet obstinate coughs. It is also an ingredient in some old remedies for farcy, scirrhous tumours, and cancer. For dogs, from 1 to 4 gr., in coughs and cancerous diseases. A decoction of the herb is used as a fomentation to painful tumours. Water hemlock is a more virulent poison, and often destroys cattle. M. Moiroud says that ruminants bear hemlock better than other animals. Mr. Youatt considers both common and water hemlock harmless to the horse, though he admits that cows have been poisoned by the latter.

Henbane

Narcotic and sedative. Dose, 15 to 20 gr. of the powder [1 to 2 dr. of the extract, Morton] twice or three times a day, to allay arterial action. On dogs it acts as on man: dose 3 to 5 gr. German horsedealers are said to give a plump appearance to diseased horses by mixing henbane seeds with their corn.

Honey

Demulcent, emollient, and slightly laxative. Used in cough medicines, and to make up balls. Horses are fond of it. Externally, it is detergent, and is, perhaps, useful in defending ulcers from the air.

Hops

Tonic and slightly anodyne, but chiefly used in fomentations.

Horehound

Sometimes given in coughs; a quart of the decoction, or 1 oz. of the powder.

Horse-radish

Stimulant and diuretic. Said to be useful in dropsical complaints, and in recent epidemics attended with chronic inflammation. The fresh root is rasped and mixed with barley meal.

Iodide of Iron

Tonic and alterative, promoting the action of the absorbents. Dose, 1/2 dr. to 1 dr.

Iodide of Potassium, or Hydriodate of Potash

It possesses the same properties as iodine, but irritates less. It is often combined with iodine, which it renders soluble in water. The dose, by itself, is rather larger than of iodine - from 15 to 30 gr. twice a day; to cattle, 5 to 10 grains.

Iodide of Sulphur

Used externally in scabies and other skin diseases; also applied to farcy ulcers, and indolent sores.

Iodine

Alterative, and promotes absorption. Used externally and internally to reduce glandular swellings, and scirrhous and other tumours. 5 gr. of iodine, or 1 1/2 to 2 dr. of the compound tincture, may be given twice a day in farcy. Cattle take from 5 to 10 gr., and from 1 to 2 dr. of the compound tincture. Dogs, 1/4 to 1 gr. twice daily. The compound iodine ointment is used to disperse glandular enlargements. It is rapidly superseding can-tharides.

Ipecacuanha

Little used in veterinary practice, except as a sudorific, in combination with opium (Dover's powder). A drachm or two may be given to horses in asthmatic affections. It purges sheep, purges or produces vomiting in the pig and dog. Dose for the latter, 4 to 20 gr. [Prom 2 to 30 gr. - Moiroud.] 3 oz. killed a horse [Mr. B. Clarke].

Iron

The preparations of this metal are tonic; some of them (as the sulphate and perehloride) astringent and styptic. The usual doses for a horse are, 2 oz. of iron filings, once or twice a day, with corn, or in a mash; 1 to 3 or 4 dr. of the sulphate; 2 to 6 dr. of the peroxide or carhonate, or of rust of iron, or of the powdered scales; 1 to 3 dr. of tartarized iron; and 1/2 to 1 1/2 dr. of the iodide, as an alterative, astringent, and tonic. Cattle, 2 to 4 dr. of the sulphate in chronic diarrhoea. For sheep, a sixth or eighth of the above doses. [M. Moiroud prescribes much larger doses than the above.] The tincture of perehloride of iron is prescribed in doses of 2 or 3 dr. for incontinence of urine. The sulphate is sometimes used externally in astringent lotions.