Spirit of Mindererus.
Take of volatile sal ammoniac, any quantity. Pour on it gradually distilled vinegar, till the effervescence ceases.
This medicine is useful in promoting a discharge both by the skin and urinary passages. It is also a good external application in strains and bruises.
When intended to raise a sweat, half an ounce of it in a cup of warm gruel may be given to the patient in bed every hour till it has the desired effect.
William Buchan
Domestic Medicine 2nd edition 1785