Volatile Tincture of Gum Guaiacum.
Take of gum guaiacum, four ounces; volatile aromatic spirit, a pint. Infuse without heat in a vessel, well stopped, for a few days; then strain off the tincture. A very good tincture of guaiacum, for domestic use, may be made by infusing three or four ounces of the gum in a bottle of rum or brandy.
In rheumatic complaints, a tea-spoonful of this tincture may be taken in a cup of the infusion of water-trefoil, twice or thrice a-day.
William Buchan
Domestic Medicine 2nd edition 1785