Mercurial Bolus.
Take of calomel, six grains; conserve of roses, half a drachm. Make a bolus.
Where mercury is necessary, this bolus may be taken twice or thrice a week. It may be taken over night; and if it does not operate, a few grains of jalap will be proper next day to carry it off.
William Buchan
Domestic Medicine 2nd edition 1785