A valuable home medicine, as an antacid laxative. It is particularly good when there is constipation, with sick stomach and headache. Even at the beginning of diarrhaea and cholera morbus, it is many times the best corrective medicine. Calcined magnesia is the preferred form. Water does not dissolve it; so it must be stirred well in a little water when taken. Dose, a full tea-spoonfull for a grown person, if designed to operate on the bowels. Much less will do to relieve acidity and nausea. Magnesia is not a good medicine to take when one has piles; as it sometimes produdes a burning in oper-ating freely. It is not, however, a powerful cathartic. Citrate of magnesium has been spoken of on a previous page.