Remedy for Diptheria

Chlorate of potassa is a well known means of arresting the progress of diphtheria. A solution should be kept in every family medicine chest, ready to be administered in every suspicious case of
sore throat. The solution is made by dissolving half an ounce of the chlorate in a pint of boiling water. It should be preserved in a bottle, closely corked, and when used the bottle should be shaken with sufficient violence to diffuse the crystalline sediments through the water. The dose is a tablespoonful thrice daily.

Source: The Housekeeper’s Friend: A Practical Cookbook