"Boil some marrow out of bones and combine with it in equal quantities, almond oil, white vaseline, olive oil, coconut oil, and half the quantity of castor oil. Rub well into scalp the day before washing hair."

from: The Aunt Daisy Cookbook with Household Hints, 1968

A substance that was applied to the hair as a stimulus for hair growth. You'd have to be pretty desparate before trying some home remedies. In this case, it was either kill or cure. What amazes me, is that this hint is from 1968 - not exactly the Dark Ages!