Clearing-nut

Clearing-nut (Strychnos potatorum), a small tree of the same genus with the Nux Vomica (q.v.), abundant in the forests of India, and of which the seeds are much used for clearing water. They are sold for this use in the bazaars, and travellers commonly carry some with them. These seeds being rubbed on the inside of a vessel, muddy water put into it quickly becomes clear, all impurities settling to the bottom.