Simple apparatus for percolation.
This image is from the article Simple Apparatus for Making Ethereal Tinctures, Etc., by Percolation. from the May issue of the American Journal of Pharmacy, 1883.
A herbal distance course
Henriette's herbal is one of the oldest and largest herbal medicine sites on the net. It's been online since 1995, and is run by Henriette Kress, a herbalist in Helsinki, Finland.