“If you wish to inflame man’s desire and so aid conception, strip bark from the trunk of a young oak, in spring when the leaves are not yet sprouting and the sap is rising. Grind to a powder, add pieces of Maral root, pulp of birch catkins, and two teaspoons of caltrop leaves infused in ten drops of vinegar. Mix with lard, bring to a boil, and leave to congeal. Rub on your husband in the evening. Twice a day have him drink tea decocted from caltrop stems. If this is too hot, mix it with spirits.”