An Incrassating Decoction.
Take Gum Arabick grosly powdered 3 ounces; boil it in Water (carefully stirring it, least it burn to the Skillet) from 1 quart to 28 ounces; and add Syrup of Marsh Mallows 4 ounces, mix.
It Incrassateth acrid, thin Lympha, and, as 'twere sheaths up the sharp points of its saline Particles. Its a very good Remedy, and easy to be had, against scalding Urine, may be useful in a troublesome, tickling Cough, and a Diabetes. I have tried it in a Rheumatism, but did not find it answer: And (by the by) the Serum of the Blood, in that Distemper, is not more Salt then usual, to my Taste. I use to prescribe a quarter of a pint twice a day.
Thomas Fuller
Pharmacopeia Extemporanea 1710