Most head-aches arise from imperfect digestion, either from acidity,
or from accumulations of bile. The first cause may be removed by half
a tea-spoonful of carbonate of soda, or by a dessert spoonful of
magnesia, in a small tumbler of water. But if the cause is bilious,
then two or three antibilious pills, or a pill of from two to five
grains of calomel, is the best remedy, and this may be assisted in
its operation by half an ounce of salts in a large tumbler of water,
in the morning. Washing the head with cold water, is always salutary
in habitual head-aches, particularly at rising in the mornings.