From the The Universal Household Assistant or What Every One Should Know (1884), posted for xhappyx:

Headache — new remedy for. — A new remedy for headache has been found by Dr. Haley, an Australian physician, who says that for some years past he has found minimum doses of iodine of potassium of great service in frontal headache; that is, a heavy, dull headache, situated over the brow, and accompanied by languor, chilliness, and a feeling of general discomfort, with distaste for food, which sometimes approaches to nausea, can be completely removed by a two-grain dose dissolved in half a wineglassful of water, and this quietly sipped, the whole quantity being taken in about ten minutes. In many cases, he adds, the effect of these small doses has been simply wonderful, as, for instance, a person, who a quarter of an hour ago was feeling most miserable, and refused all food, wishing only for quietness, would now take a good meal and resume his wonted cheerfulness.    Headache and Cold Feet. — There are many who suffer from headaches and cold feet. If they would plunge their feet in cold water every morning, and use the flesh-brush every night, it would relieve them both.    Headache — several cures for. — 1. Coarse brown paper soaked in vinegar and placed on the forehead is good for a sick headache. If the eyelids are gently bathed in cold water the pain in the head is generally allayed.    2. In Potosi the most violent headaches, so very common there, are cured by putting the feet in hot water.    3. A mixture of ice and salt in proportion of one to one-half, applied to the head, frequently gives instant relief from acute headache. It should be tied up in a small linen cloth, like a pad, and held as near as possible to the seat of the pain.    4. We have known some extreme cases of headache cured in half an hour by taking a teaspoonful of finely powdered charcoal in half a tumbler of water. It is an innocent yet powerful alkali.    5. For sick-headache, take a tumbler two-thirds full of finely crushed ice, the juice of one lemon, and one teacupful of white sugar. The mixture, eaten by degrees, or all at once, will allay the feverish thirst, and quiet the disturbed, qualmish stomach, as it is not sweet enough to be nauseous.    6. Sick headache can often be greatly relieved, and sometimes entirely cured, by the application of a mustard plaster at the base of the neck. The plaster should not be kept on more than a quarter of an hour.    Headache (Billious) — cure for. — Dissolve and drink two teaspoonfuls of finely-powdered charcoal in half a tumbler of water; it will relieve in fifteen minutes. Take a seidlitz powder an hour afterward.    Headache (Nervous) — relief for. — Many persons find speedy relief for nervous headache by washing the hair thoroughly in weak soda water. I have known severe cases almost wholly cured in ten minutes by this simple remedy. A friend finds it the greatest relief in cases of "rare cold," the cold symptoms entirely leaving the eyes and nose after one thorough washing of the hair. The head should be thoroughly dried afterward, and avoid draughts of air for a little while.