A Mustard poultice from the farina of black Mustard made into a paste with, or without wheaten flour commingled, constitutes one of the most powerful external stimulating applications we can employ. It quickly induces a sharp burning pain, and it excites a destructive outward inflammation which enters much more into the true skin than that which is caused by an old fashioned blister of Spanish fly. This has therefore superseded the latter as more promptly and reliably effective for the speedy relief of all active internal congestions. If the application of Mustard has caused sores, these may be best soothed and healed by lime-water liniment. Mustard flour is an infallible antiseptic and sterilising agent. It is a capital deodoriser; and if rubbed thoroughly into the bands and nails will take away all offensive stink when corrupt or dead tissues have been manipulated. If a tablespoonful of Mustard flour is added to a pint of tepid water, and taken at a draught it operates briskly as a stimulating and sure emetic. Hot water poured on bruised seeds of black Mustard makes a good stimulating footbath for helping to throw off a cold, or to dispel a headache; and meantime the volatile oil given out as an aroma, if not too strong, proves soporific. This oil contains erucic, and sinapoleic acids. When properly mixed with spirit of wine, twenty-four drops of the oil to an ounce of spirit, the essential oil forms, [378] by reason of its stimulating properties and its contained sulphur, a capital liniment for use in rheumatism, or for determining blood to the surface from deeper parts. Caution should be used not to apply a plaster made altogether of Mustard flour to the delicate skin of young children, or females, because ulcers difficult to heal may be the result, or even gangrenous destruction of the deeper skin may follow. The effects of a Mustard bath, at about ninety degrees, are singular; decided chills are felt at first throughout the whole body, with some twitchings at times of the limbs; and later on, even after the skin surface has become generally red, this sense of coldness persists, until the person leaves the water, when reaction becomes quickly established, with a glowing heat and redness of the whole skin. For obstinate hiccough a teacupful of boiling water should be poured on a teaspoonful of Mustard flour, and taken when sufficiently cool, half at first, and the other half in ten minutes if still needed. For congestive headache a small roll of Mustard paper or Mustard leaf may be introduced into one or both nostrils, and left there for a minute or more. It will relieve the headache promptly, and may perhaps induce some nose bleeding. Admixture with vinegar checks the development of the pungent principles of Mustard. This used to be practised for the table in England, but is now discontinued, though some housewives add a little salt to their made Mustard.