The permanganate of potassium is a recent addition to emmenagogues, and the testimony in its favor is already sufficient to make it probable that it is the most efficient of the list. The indications for its use are want of action or atony of the organs. It should be administered during a few days or a week preceding the time for menstruation, in doses of from two to four grains three times daily; or two grains three times daily may be administered during the whole month. The union of its elements is but feeble, so that in pills as ordinarily made it would be very likely to undergo decomposition, while in solution it is unpleasant. Compressed tablets of the pure drug are now placed at command of the profession, and are an unexceptionable form for administration. The best time for taking the medicine is toward the close of the digestive process, and each dose should be followed by drinking at least a wineglassful of water. Pain in the stomach has been sometimes observed even when every precaution has been taken. The liability of the remedy to decomposition and its irritating powers are objections to it, but the testimony in favor of its power to bring on or promote the menstrual flow is at present very strong. More decided measures of local stimulation than those already given may be resorted to, and are far more reliable than drugs. They are--tents, cupping the uterus, and electricity. A sea-tangle or tupelo tent may be kept in the uterus over night just previous to the time of the flow. In cases where stimulation rather than dilatation is needed a tent of slippery-elm bark may be used. Thomas recommends a rubber exhauster for cupping the cervix uteri. Simpson fashioned one for acting on the lining membrane of the body. These measures are most likely to be efficacious just before an expected period.