From The Long Lost Friend:
Weakness Of Limbs
Take the buds of the birch tree, or the inner bark of the root of the tree at the time of the budding of the birch, and make a tea of it, and drink it occasionally through the day. Yet, after having used it for two weeks, it must be discontinued for a while, before it is resorted to again; and during the two weeks of its use it is well at times to use water for a day instead of the tea. ANOTHER REMEDY FOR WEAKNESS. Take Bittany and St. John's wort, and put them in good old rye whiskey. To drink some of this in the morning before having taken anything else, is very wholesome and good. A tea made of the acorns of the white oak is very good for weakness of the limbs.
The grimoire The Long Lost Friend lists this spell.
Timeline of related events
1820Publication of Hohmann's Long Lost Friend (lists this spell)