Dandruff
Put one ounce of quassia chips into a cupful of water ; let it stand for twenty-four hours, and apply to the head, brushing it well into the roots.
Source: Recipes for the Million
A Splendid Hair Tonic
A strong tincture for the hair is made by adding half an ounce of oil of mace to a pint of deodorized alcohol. Pour a spoonful or two into a saucer; dip a small stiff brush into it, and brush the hair smartly, rubbing the tincture well into the roots. On bald spots, if hair will start at all, it may be stimulated by friction with a piece of flannel until the skin looks red, and rubbing the tincture into the scalp. This process must be repeated three times a day for weeks. When the hair begins to grow, apply the tincture once a day until the growth is well established, bathing the head in cold water every morning, and briskly brushing it to bring the blood to the surface.”
Source: The Housekeeper’s Friend: A Practical Cookbook
To Preserve and Strengthen the Hair
One ounce of bi-carbonate of soda, two drams of tincture of cantharides, two ounces of spirits of rosemary, and a half pint of rosewater. Mix the bi-carbonate of soda with the rosewater, and add the other ingredients. Apply it with a sponge, rubbing it well into the roots of the hair until a lather is produced; then rinse with water, and dry on a coarse towel.
Source: 76: A Cook Book