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848. After Leeches have been Used After leeches have been used they should be placed in water containing sixteen per cent. of salt, which facilitates the removal of the blood they contain; and they should afterwards be placed one by one in warm water, and the blood forced out by gentle pressure. The leeches should then be thrown into fresh water, which is to be renewed every twenty-four hours: they may then be re-applied after an interval of eight or ten days, and be disgorged a second time. The best plan, however, is to empty the leech by drawing the thumb and forefinger of the right hand along its body from the tail to the mouth, the leech being firmly held at the sucker extremity by the fingers of the left hand. By this means, with a few minutes' rest between each application, the same leech may be used four or five times in succession. 849. If a Leech be Accidentally Swallowed, If a leech be accidentally swallowed, or by any means should get into the body, employ an emetic, or enema of salt and water. 850. Scarification Scarification is useful in severe contusions, and inflammation of parts. It is performed by scratching or slightly cutting through the skin with a lancet, holding the lancet as you would a pen when you are ruling lines on paper. 851. Terms used to express the Properties of Medicines. 852. Absorbents Absorbents are medicines which destroy acidity in the stomach and bowels, such as magnesia, prepared chalk, &c.