Vinegar Plant.
Take ¼ lb. of treacle and the same of brown sugar and boil them in 3 pts. of water and let it stand till cold in the basin, then place the vinegar plant upon the liquor. In six weeks the vinegar will be ready to be bottled; well cork it. Put a piece of horse-radish into the bottle to remain a fortnight. At the end of that time, take the horse-radish out, and the vinegar will be strong and fit for use.
The plant will have a baby fungus on it, remove this and put it into a basin of its own. Treat that in same way. The old plant also does again.